{"title":"Askar Narrowband Filters","description":"\u003cp\u003eAskar narrowband filters. Part of \u003ca href=\"\/collections\/askar-filters\"\u003eAskar Filters\u003c\/a\u003e.\u003c\/p\u003e","products":[{"product_id":"36mm-oiii-7nm-filter","title":"36mm OIII 7nm filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar O III 7nm filter is suitable for imaging of O III emitting nebulae or some supernova remnants. The Askar O III filter has an extreme high transmission at a center wavelength of 500.7nm. The 7nm narrow bandwidth enables this astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar O III filter is an ideal instrument for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar O III filter is designed for improving the contrast and details of some nebulae and supernova remnants. It works well on those nebulae emitting O III. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 500.7nm, the Askar O III filter can bring out the most amount of details of the emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar O III filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently suppressing other off-band wavelength. That’s why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar O III filter can efficiently reject all the light pollution. You can expect a terrific performance of this O III filter in artificially-brighten background sky.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe production process is strictly controlled and every single Askar O III narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; color: rgb(68, 68, 68); font-family: Arial;\"\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-size: 14px; font-family: Arial;\"\u003e· Useful for imaging O III emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· The Askar O III narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun or other non-O III-emitting objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013677248623,"sku":"A-OIII-36","price":239.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252698__85779.jpg?v=1766559375"},{"product_id":"sii-36mm-filter","title":"SII 36mm Filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar S II 7nm filter is suitable for imaging of S II emitting nebulae or some supernova remnants. The Askar H-alpha filter has an extreme high transmission at a center wavelength of 671.6nm. The 7nm narrow bandwidth enables this astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar S II filter is an ideal instrument for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar H-alpha filter is designed for improving the contrast and details of some nebulae and supernova remnants. Though there is very little sulfur in nebulae, but the emission from the trace of S II in nebulae is rather strong. The deep-red light emitted from S II can bring out the quite delicate detail which is different from those regions that release H-alpha light. So it works well on those nebulae emitting S II. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 671.6nm, the Askar S II filter can bring out the most amount of details of the emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar S II filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently suppressing other off-band wavelength. That’s why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar S II filter can efficiently reject all the light pollution. You can expect a terrific performance of this S II filter in artificially-brighten background sky.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe production process is strictly controlled and every single Askar S II narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; font-family: Arial; color: rgb(68, 68, 68);\"\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: Arial; color: rgb(68, 68, 68);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: Arial; color: rgb(68, 68, 68);\"\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Useful for imaging S II emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· The Askar S II narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun or other non-S II-emitting objects.\u003c\/span\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013682032751,"sku":"A-SII-36","price":239.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252638__36276.jpg?v=1766559624"},{"product_id":"ha-1-25-filter","title":"Ha 1.25\" Filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe Askar H-alpha (Ha) 7nm filter is a helpful tool for imaging of H-alpha emitting nebulae or some supernova remnants. The Askar H-alpha filter has an extreme high transmission at a center wavelength of 656.3nm. The 7nm narrow bandwidth enables this nebula-imaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar H-alpha filter is suitable for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe Askar H-alpha filter is designed for further improving the contrast and details of various types of nebulae and supernova remnants, the large emission nebulae in some spiral galaxies, for example. It works well on those nebulae emitting ionized hydrogen or the H II regions in nearby galaxies. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 656.3nm, the Askar H-alpha filter can bring out the most amount of details of the nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar H-alpha filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently blocking other off-band wavelength. That's why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar H-alpha filter can efficiently reject all the light pollution. You can expect a terrific performance of this H-alpha filter in artificially-brighten background sky.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe production process is strictly controlled and every single Askar H-alpha narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; font-family: ????, \" microsoft yahei color: rgb\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e· Useful for imaging H-alpha emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· The Askar H-alpha narrowband filter is not suitable for visual observation and not designed for imaging or observing the sun or other non-Ha-emitting objects.\u003c\/span\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013682163823,"sku":"A-Ha-1","price":189.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252651__10453.jpg?v=1766559631"},{"product_id":"sii-1-25filter","title":"SII 1.25\"Filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar S II 7nm filter is suitable for imaging of S II emitting nebulae or some supernova remnants. The Askar H-alpha filter has an extreme high transmission at a center wavelength of 671.6nm. The 7nm narrow bandwidth enables this astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar S II filter is an ideal instrument for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar H-alpha filter is designed for improving the contrast and details of some nebulae and supernova remnants. Though there is very little sulfur in nebulae, but the emission from the trace of S II in nebulae is rather strong. The deep-red light emitted from S II can bring out the quite delicate detail which is different from those regions that release H-alpha light. So it works well on those nebulae emitting S II. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 671.6nm, the Askar S II filter can bring out the most amount of details of the emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar S II filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently suppressing other off-band wavelength. That’s why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar S II filter can efficiently reject all the light pollution. You can expect a terrific performance of this S II filter in artificially-brighten background sky.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe production process is strictly controlled and every single Askar S II narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; font-family: Arial; color: rgb(68, 68, 68);\"\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: Arial; color: rgb(68, 68, 68);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: Arial; color: rgb(68, 68, 68);\"\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Useful for imaging S II emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· The Askar S II narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun or other non-S II-emitting objects.\u003c\/span\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013682327663,"sku":"A-SII-1","price":189.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252638__95601.jpg?v=1766559642"},{"product_id":"sii-2-filter","title":"SII 2\" Filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar S II 7nm filter is suitable for imaging of S II emitting nebulae or some supernova remnants. The Askar H-alpha filter has an extreme high transmission at a center wavelength of 671.6nm. The 7nm narrow bandwidth enables this astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar S II filter is an ideal instrument for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar H-alpha filter is designed for improving the contrast and details of some nebulae and supernova remnants. Though there is very little sulfur in nebulae, but the emission from the trace of S II in nebulae is rather strong. The deep-red light emitted from S II can bring out the quite delicate detail which is different from those regions that release H-alpha light. So it works well on those nebulae emitting S II. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 671.6nm, the Askar S II filter can bring out the most amount of details of the emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar S II filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently suppressing other off-band wavelength. That’s why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar S II filter can efficiently reject all the light pollution. You can expect a terrific performance of this S II filter in artificially-brighten background sky.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe production process is strictly controlled and every single Askar S II narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; font-family: Arial; color: rgb(68, 68, 68);\"\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: Arial; color: rgb(68, 68, 68);\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: Arial; color: rgb(68, 68, 68);\"\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Useful for imaging S II emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· The Askar S II narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun or other non-S II-emitting objects.\u003c\/span\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013682458735,"sku":"A-SII-2","price":319.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252638__53715.jpg?v=1766559648"},{"product_id":"ha-2-filter","title":"Ha 2\" Filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe Askar H-alpha (Ha) 7nm filter is a helpful tool for imaging of H-alpha emitting nebulae or some supernova remnants. The Askar H-alpha filter has an extreme high transmission at a center wavelength of 656.3nm. The 7nm narrow bandwidth enables this nebula-imaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar H-alpha filter is suitable for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe Askar H-alpha filter is designed for further improving the contrast and details of various types of nebulae and supernova remnants, the large emission nebulae in some spiral galaxies, for example. It works well on those nebulae emitting ionized hydrogen or the H II regions in nearby galaxies. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 656.3nm, the Askar H-alpha filter can bring out the most amount of details of the nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar H-alpha filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently blocking other off-band wavelength. That's why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar H-alpha filter can efficiently reject all the light pollution. You can expect a terrific performance of this H-alpha filter in artificially-brighten background sky.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe production process is strictly controlled and every single Askar H-alpha narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; font-family: ????, \" microsoft yahei color: rgb\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e· Useful for imaging H-alpha emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· The Askar H-alpha narrowband filter is not suitable for visual observation and not designed for imaging or observing the sun or other non-Ha-emitting objects.\u003c\/span\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013683245167,"sku":"A-Ha-2","price":319.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252651__10009.jpg?v=1766559654"},{"product_id":"ha-36mm-filter","title":"Ha 36mm Filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe Askar H-alpha (Ha) 7nm filter is a helpful tool for imaging of H-alpha emitting nebulae or some supernova remnants. The Askar H-alpha filter has an extreme high transmission at a center wavelength of 656.3nm. The 7nm narrow bandwidth enables this nebula-imaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar H-alpha filter is suitable for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe Askar H-alpha filter is designed for further improving the contrast and details of various types of nebulae and supernova remnants, the large emission nebulae in some spiral galaxies, for example. It works well on those nebulae emitting ionized hydrogen or the H II regions in nearby galaxies. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 656.3nm, the Askar H-alpha filter can bring out the most amount of details of the nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar H-alpha filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently blocking other off-band wavelength. That's why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar H-alpha filter can efficiently reject all the light pollution. You can expect a terrific performance of this H-alpha filter in artificially-brighten background sky.\u003c\/p\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003eThe production process is strictly controlled and every single Askar H-alpha narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; font-family: ????, \" microsoft yahei color: rgb\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e· Useful for imaging H-alpha emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-family: ????, \" microsoft yahei color: rgb\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei\u003e· The Askar H-alpha narrowband filter is not suitable for visual observation and not designed for imaging or observing the sun or other non-Ha-emitting objects.\u003c\/span\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013683376239,"sku":"A-Ha-36","price":239.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252651__21975.jpg?v=1766559663"},{"product_id":"oiii-7nm-filter-1-25-fitler","title":"OIII 7nm filter 1.25\" Fitler","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar O III 7nm filter is suitable for imaging of O III emitting nebulae or some supernova remnants. The Askar O III filter has an extreme high transmission at a center wavelength of 500.7nm. The 7nm narrow bandwidth enables this astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar O III filter is an ideal instrument for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar O III filter is designed for improving the contrast and details of some nebulae and supernova remnants. It works well on those nebulae emitting O III. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 500.7nm, the Askar O III filter can bring out the most amount of details of the emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar O III filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently suppressing other off-band wavelength. That’s why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar O III filter can efficiently reject all the light pollution. You can expect a terrific performance of this O III filter in artificially-brighten background sky.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe production process is strictly controlled and every single Askar O III narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; color: rgb(68, 68, 68); font-family: Arial;\"\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-size: 14px; font-family: Arial;\"\u003e· Useful for imaging O III emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· The Askar O III narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun or other non-O III-emitting objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013683507311,"sku":"A-OIII-1","price":189.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252698__31385.jpg?v=1766559669"},{"product_id":"oiii-7nm-filter-2-filter","title":"OIII 7nm filter 2\" Filter","description":"\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar O III 7nm filter is suitable for imaging of O III emitting nebulae or some supernova remnants. The Askar O III filter has an extreme high transmission at a center wavelength of 500.7nm. The 7nm narrow bandwidth enables this astroimaging filter to block all the light pollution and other unwanted artificial lights or night glow. So the Askar O III filter is an ideal instrument for astro-imaging in heavily light-pollution hit locations and delivers enhanced contrast at darker places.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe Askar O III filter is designed for improving the contrast and details of some nebulae and supernova remnants. It works well on those nebulae emitting O III. Featuring 7nm narrow bandwidth and a greatly high transmission at a center wavelength of 500.7nm, the Askar O III filter can bring out the most amount of details of the emission nebulae, planetary nebulae and supernova remnants. Also, the out-of-band blocking ability is rated with OD4 (0.01%) with the blocking range of 200-1050nm. It delivers an excellent signal-to-noise ratio and a sharp cut-off rate to attenuate the disturbance from other wavelengths.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe narrow bandwidth and an effective cut-off rate are important indices when choosing a narrowband filter. The Askar O III filter has a narrow bandwidth of 7nm and an extreme transmission of 90% at the peak, in the meanwhile, sufficiently suppressing other off-band wavelength. That’s why we sometimes call those 7nm-bandwidth, or even a smaller bandwidth of 3nm, a line filter. So the Askar O III filter can efficiently reject all the light pollution. You can expect a terrific performance of this O III filter in artificially-brighten background sky.\u003c\/span\u003e\u003c\/p\u003e\u003cspan style=\"font-family: Arial;\"\u003e\u003cbr style=\"outline: none; box-sizing: border-box; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei font-size: text-align: justify\u003e\u003c\/span\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cspan style=\"font-family: Arial;\"\u003eThe production process is strictly controlled and every single Askar O III narrowband filter is individually examined and tested to ensure that they can highly satisfy the observing interests and needs of our customers.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; font-weight: bold; color: rgb(68, 68, 68); font-family: Arial;\"\u003eApplication\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Narrow 7mn bandwidth, properly designed for astrophotography both in light polluted or dark locations.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"color: rgb(68, 68, 68); font-size: 14px; font-family: Arial;\"\u003e· Useful for imaging O III emitting nebulae, planetary nebulae and supernova remnants.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· High transmission of 90% and excellent cut-off can greatly enhance the contrast and bring out the most detailed information for those deep-sky objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· Designed to sharply cut off the inference of artificial light from sodium vapor or mercury vapor street lights and other unwanted disturbance like sky glow.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; text-align: justify;\"\u003e\u003cspan style=\"font-size: 14px; color: rgb(68, 68, 68); font-family: Arial;\"\u003e· The Askar O III narrowband filter is not suitable for visual observation and not designed for imaging or observing the Sun or other non-O III-emitting objects.\u003c\/span\u003e\u003c\/p\u003e\u003cp style=\"outline: none; box-sizing: border-box; margin: 0px; padding: 0px; color: rgb(68, 68, 68); font-family: ????, \" microsoft yahei justify font-size:=\"\" text-align:=\"\"\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":44013683540079,"sku":"A-OIII-2","price":319.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/1612252698__08164.jpg?v=1766559675"}],"url":"https:\/\/ontariotelescope.com\/collections\/askar-narrowband.oembed","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}