{"product_id":"takahashi-tpl-9-plossl-eyepiece","title":"Takahashi TPL-9 Plossl Eyepiece","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe TPL-9 is a 9mm eyepiece from Takahashi's TPL Plossl series, the successor to the older Abbe and LE lines. It uses a 4-elements-in-2-groups Plossl design built with high-refraction, low-dispersion glass, giving a 48° apparent field of view and 6.5mm of eye relief. It weighs 70g and uses the standard 31.7mm (1.25”) barrel.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eWho It's For\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThis is a good match if you want a mid-to-high power eyepiece for planetary detail, lunar craters, and closer double stars, with more forgiving eye relief than the shortest focal lengths in the series.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eKey Features \u0026amp; Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-element, 2-group Plossl design:\u003c\/strong\u003e the current evolution of Takahashi's Plossl line, replacing the older Abbe and LE series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-refraction, low-dispersion glass:\u003c\/strong\u003e Takahashi states this cuts chromatic aberration at the center of the field to roughly half the level of the Abbe series and two-thirds that of the LE series.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMultilayer coatings at 99% transmission:\u003c\/strong\u003e keeps the image bright across the four elements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMatte-finished interior:\u003c\/strong\u003e reduces stray light and internal reflections for better contrast.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e48° apparent field of view\u003c\/strong\u003e and \u003cstrong\u003e6.5mm eye relief\u003c\/strong\u003e at this focal length.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003e\u003cstrong\u003eOptical \/ Mechanical Design\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eTakahashi describes the TPL series as sharp from the center out to roughly halfway across the field, with only mild star distortion at the corners on its own — and notes that pairing a TPL eyepiece with the 2x Ortho Barlow (sold separately) measurably flattens the field, producing close to full-field correction. At 9mm, the TPL-9 sits mid-range in the series, balancing usable magnification against comfortable eye relief.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eRecommended Uses\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eOn a Takahashi TSA-120 (900mm, f\/7.5) the TPL-9 gives about 100x, a solid all-around planetary magnification. On a Takahashi FS-60CB (355mm, f\/5.9) the same eyepiece yields roughly 39x, useful for brighter deep-sky targets on a small travel refractor. Divide any Takahashi tube's focal length by 9mm for the magnification on your own setup.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eCompatibility and Accessory Notes\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eThe 31.7mm (1.25”) barrel fits any Takahashi focuser, star diagonal, or 2″-to-1.25” adapter in the current lineup. Takahashi's own literature notes that combining a TPL eyepiece with the 2x Ortho Barlow improves flat-field performance across the whole view — worth considering if you already use a Barlow in your kit or are deciding whether to add one.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eGood to Know Before You Order\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eNot parfocal:\u003c\/strong\u003e a refocus is needed when swapping the TPL-9 in from another eyepiece in your case.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eIs it difficult to set up?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eNo — it threads directly into a standard 1.25” focuser or diagonal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is it best used for?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eMid-to-high power visual observing — planetary detail, lunar craters, and double stars.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does it compare to the Starbase OR-9mm?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eBoth are 9mm, 4-element eyepieces with a 1.25” barrel. The TPL series uses Takahashi's higher-refraction, low-dispersion glass and multilayer coatings rated at 99% transmission, positioning it a step up from the Starbase budget line at a correspondingly higher price.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat telescopes does it fit?\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003eAny Takahashi refractor or reflector with a standard 1.25” focuser or diagonal.\u003c\/p\u003e\u003ch3\u003e\u003cstrong\u003eBottom Line\u003c\/strong\u003e\u003c\/h3\u003e\u003cp\u003eA 9mm Plossl eyepiece with a 48° field, 6.5mm eye relief, and a 70g weight — a mid-to-high power option in Takahashi's TPL series, built around high-refraction, low-dispersion glass. If you're building a full eyepiece set and want help matching focal lengths to your telescope, send us your setup and we'll work it out with you.\u003c\/p\u003e","brand":"Takahashi","offers":[{"title":"Default Title","offer_id":54047076843631,"sku":"TAK-TKA00620","price":274.56,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0686\/0049\/6239\/files\/tka00620.jpg?v=1786912886","url":"https:\/\/ontariotelescope.com\/products\/takahashi-tpl-9-plossl-eyepiece","provider":"Ontario Telescope and Accessories","version":"1.0","type":"link"}