{"product_id":"askar-fra400-quintuplet-flat-field-astrograph","title":"Askar FRA400 Quintuplet Flat-Field Astrograph","description":"\u003ch2\u003eProduct Overview\u003c\/h2\u003e\u003cp\u003eThe Askar FRA400 is a compact quintuplet astrograph with a 72mm aperture, 400mm focal length, and native f\/5.6 focal ratio. It is designed as a flat-field refractor for wide-field deep-sky astrophotography and can also be used for visual observing with suitable accessories.\u003c\/p\u003e\u003ch2\u003eWho Is This Product Best For?\u003c\/h2\u003e\u003cp\u003eThe FRA400 is best for beginner-to-intermediate imagers who want a portable wide-field refractor, travel astrophotographers, and advanced users looking for a compact full-frame-capable optical tube for nebulae and large deep-sky targets.\u003c\/p\u003e\u003ch2\u003eWhy Choose This Product?\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eQuintuplet optical design for flat-field imaging.\u003c\/li\u003e\n\u003cli\u003e72mm aperture and 400mm focal length for wide-field targets.\u003c\/li\u003e\n\u003cli\u003eNative f\/5.6 speed with optional reducer support for faster imaging.\u003c\/li\u003e\n\u003cli\u003eCompact optical tube for travel and portable equatorial mounts.\u003c\/li\u003e\n\u003cli\u003eUseful for nebulae, star fields, large galaxies, and comet imaging.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eRecommended Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWide-field deep-sky astrophotography.\u003c\/li\u003e\n\u003cli\u003ePortable imaging rigs.\u003c\/li\u003e\n\u003cli\u003eFull-frame and APS-C camera setups when correctly configured.\u003c\/li\u003e\n\u003cli\u003eVisual observing with suitable diagonal and eyepieces.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eCompatibility and Accessory Notes\u003c\/h2\u003e\u003cp\u003eThe FRA400 can be used natively at 400mm f\/5.6. A dedicated 0.7x reducer is available for users who want a faster and wider f\/3.9 configuration. Imaging users should confirm thread adapters, camera spacing, filter placement, and mount payload before setup.\u003c\/p\u003e\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRequires a suitable equatorial mount for astrophotography.\u003c\/li\u003e\n\u003cli\u003eCamera-side adapters and spacers may be required depending on the imaging train.\u003c\/li\u003e\n\u003cli\u003eThe optional reducer is not included.\u003c\/li\u003e\n\u003cli\u003eNot the best choice for small planetary imaging targets where longer focal length is preferred.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eIs the FRA400 good for beginners?\u003c\/h3\u003e\u003cp\u003eYes. It is a friendly starting point for wide-field imaging, but users should still expect to learn polar alignment, guiding, focusing, and camera spacing.\u003c\/p\u003e\u003ch3\u003eWhat is it best used for?\u003c\/h3\u003e\u003cp\u003eIt is best used for wide-field deep-sky astrophotography, especially larger nebulae, star fields, and extended objects.\u003c\/p\u003e\u003ch3\u003eIs it for visual observing or imaging?\u003c\/h3\u003e\u003cp\u003eIt is primarily an astrograph for imaging, but can also be used visually with suitable accessories.\u003c\/p\u003e\u003ch3\u003eDoes it require additional accessories?\u003c\/h3\u003e\u003cp\u003eMost imagers will need a camera, adapters, filters if desired, a guide system if needed, and a suitable tracking mount.\u003c\/p\u003e\u003ch2\u003eOur Recommendation\u003c\/h2\u003e\u003cp\u003eOntario Telescope recommends the FRA400 for customers who want a compact flat-field refractor for wide-field deep-sky imaging. Choose a longer focal length telescope for small galaxies, planets, or close-up lunar work.\u003c\/p\u003e\u003ctable class=\"product-specifications\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eFlat-field astrograph refractor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAperture\u003c\/th\u003e\n\u003ctd\u003e72mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Length\u003c\/th\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFocal Ratio\u003c\/th\u003e\n\u003ctd\u003ef\/5.6\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptical Design\u003c\/th\u003e\n\u003ctd\u003eQuintuplet astrograph\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOptional Reducer\u003c\/th\u003e\n\u003ctd\u003e0.7x reducer available separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePrimary Use\u003c\/th\u003e\n\u003ctd\u003eWide-field deep-sky astrophotography\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Askar","offers":[{"title":"Default Title","offer_id":53155914252399,"sku":"FRA400","price":1674.99,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/FRA400Sa.webp?v=1779736657","url":"https:\/\/ontariotelescope.com\/products\/askar-fra400-quintuplet-flat-field-astrograph","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}