{"product_id":"pentax-16-5mm-xw-eyepiece-with-smc-coatings-2-70540","title":"Pentax 16.5mm XW Eyepiece with SMC Coatings - 2\" - 70540","description":"\u003ch3\u003ePentax XW Eyepiece Series\u003c\/h3\u003e\n\n\u003cp\u003eFeaturing functional, practical focal lengths, the Pentax XW weatherproof eyepiece series provides a comprehensive line-up of magnifications that accommodates all types of applications, from low-magnification viewing of deep-sky objects to high-magnification observations of planets.\u003c\/p\u003e\u003cp\u003e\n\n\u003c\/p\u003e\u003ch3\u003eAbout the Pentax 16.5mm XW 2\" Eyepiece\u003c\/h3\u003e\n\n\u003cp\u003eThe Pentax 16.5mm XW eyepiece offers clear, comfortable viewing, with a \u003cem\u003elarge 85° apparent angle of view\u003c\/em\u003e and 20mm of eye relief with the adjustable eyecup in its lowest position.  With a twist of the light-shield, you can place your eye at the best position for comfortable viewing that still offers the best contrast.\u003c\/p\u003e\u003cp\u003e\n\n\u003c\/p\u003e\u003cp\u003eThis focal length eyepiece has a 2\", or 50.8 mm, installation barrel.  The top of the eyepiece also has a screw thread with a 43mm diameter and a 0.75 pitch when the light shield\/eye cup is removed.\u003c\/p\u003e  \n\n\u003ch3\u003ePentax High-Grade Lanthanum Optics for Exceptional Image Quality\u003c\/h3\u003e\n\n\u003cp\u003eThe high performance optics used in all Pentax XW eyepieces incorporates high-refraction, extra-low-dispersion lanthanum glass elements to produce a well-balanced image with minimal aberrations. The XW eyepiece is particularly designed to reduce the disturbing blackout effect by effectively compensating the spherical aberration of the pupil.\u003c\/p\u003e\n\n\u003cp\u003eAll lens surfaces that come in contact with air are treated with the original SMC multi-layer coating, while all laminated surfaces are treated with an innovative partial coating to offer the light transmission efficiency of more than 90 percent (an astonishing 96 percent at 550nm) over the visible light spectrum.\u003c\/p\u003e\n\n\n\u003ch3\u003eWeatherproof Construction for All-Weather Viewing\u003c\/h3\u003e\n\n\u003cp\u003eThe Pentax XW series eyepieces feature JIS Class 4 weatherproof construction.  While you cannot submerge these weatherproof eyepieces under water, their JIS Class 4 construction makes it possible to use them in drizzle or under dewy night conditions.\u003c\/p\u003e\n\n\u003ch3\u003ePentax 16.5mm XW Eyepiece Specifications\u003c\/h3\u003e\n\n\n\u003cul\u003e\u003cli\u003eFocal Length: 16.5mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nNumber of Elements\/Groups:  7 Elements in 5 Groups\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nApparent Angle of View:  85º\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nEye Relief:  20 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nDistance from Rubber Cup:  12 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nBarrel Size:  2\"\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nLength \u0026amp; Diameter:  142mm x 76 mm\u003c\/li\u003e\u003c\/ul\u003e\u003cul\u003e\u003cli\u003e\nWeight in Grams:  745g\u003c\/li\u003e\u003c\/ul\u003e","brand":"Pentax","offers":[{"title":"Default Title","offer_id":40431720366193,"sku":"PEN-70540","price":464.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/XW16_5.png?v=1776459118","url":"https:\/\/khanscope.com\/en-fr\/products\/pentax-16-5mm-xw-eyepiece-with-smc-coatings-2-70540","provider":"Khan Scope Centre","version":"1.0","type":"link"}