{"product_id":"televue-oculare-nagler-zoom-3-6mm-planetario","title":"TeleVue Nagler Zoom 3-6mm Eyepiece 1.25“","description":"\u003cp\u003eThe \u003cstrong\u003eTeleVue Nagler Zoom 3-6mm\u003c\/strong\u003e was born from a very specific need of Al Nagler's: finding, night after night, the highest useful magnification that atmospheric seeing allows, without constantly swapping eyepieces. With a \u003cstrong\u003econstant 50° apparent field of view\u003c\/strong\u003e across the entire zoom range and a design using just 5 elements in 3 groups, it delivers contrast and sharpness that rival a good fixed-focal-length eyepiece — a rare feat for a zoom.\u003c\/p\u003e\n\n\u003ch3\u003eWhy a planetary zoom, not a wide-angle\u003c\/h3\u003e\n\u003cp\u003eUnlike the Nagler Type 6, designed for 82° immersion, the Zoom came from a different project: four eyepieces in one, with click-stops at 3, 4, 5 and 6mm (plus intermediate focal lengths), while keeping \u003cstrong\u003econstant focus, constant apparent field of view, and roughly 10mm of constant eye relief\u003c\/strong\u003e across the whole range. Simply rotating the upper barrel changes magnification without ever losing focus — particularly useful when atmospheric conditions shift over the course of an evening and power needs quick adjustment.\u003c\/p\u003e\n\n\u003ch3\u003eFew optical elements, for maximum contrast\u003c\/h3\u003e\n\u003cp\u003eBy keeping the lens count low (5 elements versus 7-9 in many competing zooms), the Nagler Zoom retains higher contrast, with fewer surfaces scattering light along the optical path. Multi-layer coating on all surfaces further reduces internal reflections.\u003c\/p\u003e\n\n\u003ch3\u003eConstruction and compatibility\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e1.25\" (31.75mm) barrel\u003c\/strong\u003e features \u003cstrong\u003efilter threads for standard astronomy filters\u003c\/strong\u003e and a non-slip rubber grip. The eyecup is \u003cstrong\u003efold-down\u003c\/strong\u003e. At just 150 grams, it's among the lightest and most compact TeleVue eyepieces, suitable also for lightweight mounts and small refractors.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\u003cth\u003eProduct code\u003c\/th\u003e\u003ctd\u003eENZ-0306\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eSeries\u003c\/th\u003e\u003ctd\u003eNagler Zoom\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eFocal length\u003c\/th\u003e\u003ctd\u003e3-6 mm (continuous zoom, click-stops at 3, 4, 5, 6mm)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eApparent field of view (AFOV)\u003c\/th\u003e\u003ctd\u003e50° (constant across the range)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eEye relief\u003c\/th\u003e\u003ctd\u003e10 mm (constant)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eOptical elements\u003c\/th\u003e\u003ctd\u003e5 (in 3 groups)\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eOptical coating\u003c\/th\u003e\u003ctd\u003eMulti-layer on all surfaces\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eBarrel\u003c\/th\u003e\u003ctd\u003e1.25\" (31.75mm) with filter threads\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eEyecup\u003c\/th\u003e\u003ctd\u003eRubber, fold-down\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eWeight\u003c\/th\u003e\u003ctd\u003e150 g\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003cth\u003eMade in\u003c\/th\u003e\u003ctd\u003eUSA — TeleVue Optics\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ch2\u003eWho it's recommended for\u003c\/h2\u003e\n\u003cp\u003eIdeal for high-power lunar and planetary observing on short focal-length telescopes (fast apochromatic refractors, small Newtonians), for anyone wanting to fine-tune magnification in real time to match seeing conditions without carrying multiple fixed eyepieces. Not suitable for eyeglass wearers, given the limited 10mm eye relief.\u003c\/p\u003e","brand":"TeleVue","offers":[{"title":"Default Title","offer_id":57897311011147,"sku":"TV14716","price":659.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/1981\/1147\/files\/TeleVue-Oculare-Nagler-Zoom-3-6mm-1-25_9b90605d-f0f7-451a-a796-f362f55ccce7.jpg?v=1784407244","url":"https:\/\/adriasky.it\/en\/products\/televue-nagler-zoom-3-6mm-eyepiece-planetary","provider":"Adriasky","version":"1.0","type":"link"}