{"product_id":"tele-vue-2x-big-barlow-2-bwc-2211","title":"Tele Vue 2X BIG Barlow - 2\" - BWC-2211","description":"\u003ccenter\u003e\n\u003ch2\u003eAbout the TeleVue 2X BIG Barlow - 2\"...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003eProperly designed \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eBarlow lenses\u003c\/a\u003e do wonderful things: They amplify power, slow the \u003ca href=\"http:\/\/khanscope.com\/newEquipCart.cfm?catID=1\u0026amp;subcatID=1\"\u003etelescope\u003c\/a\u003e'''s f\/# (improving eyepiece sharpness), and give designers the opportunity to compensate for \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003etelescope eyepiece\u003c\/a\u003e aberrations.\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eTele Vue Barlow Lenses\u003c\/b\u003e use multi-coated high index glasses for optimum aberration correction, exceptional contrast with virtually no light loss. Observed performance is aberration free, even when tested with f\/4 \u003ca href=\"http:\/\/khanscope.com\/newEquipCart.cfm?catID=1\u0026amp;subcatID=1\"\u003etelescope\u003c\/a\u003e. \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Barlow Lenses\u003c\/a\u003e even improve our competitor'''s \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003etelescope eyepieces\u003c\/a\u003e and \u003ca href=\"http:\/\/khanscope.com\/newEquipCart.cfm?catID=1\u0026amp;subcatID=1\"\u003etelescopes\u003c\/a\u003e!\u003c\/p\u003e\n\u003cp\u003e\u003ci\u003e\"I originally designed the \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Barlow Lens\u003c\/a\u003e line to complement the high performance of our \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepieces\u003c\/a\u003e. Only 2 elements of high index glass were required to reduce all aberrations to well below the airy disc in an f\/4 system. It has taken a good 15 years, but I think we'''re finally laying to rest the popular myth of the \"degrading Barlow.\" In a 1997 Sky \u0026amp; Telescope review, Terrence Dickenson wrote \"...Technology has erased the old objections. A modern \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eBarlow lens\u003c\/a\u003e will not degrade your \u003ca href=\"http:\/\/khanscope.com\/newEquipCart.cfm?catID=1\u0026amp;subcatID=1\"\u003etelescope\u003c\/a\u003e'''s optics. Anyone telling you otherwise is using outdated information. Moreover, the highly regarded Nagler \u003ca href=\"http:\/\/khanscope.com\/accessDetails.cfm?productID=5224\"\u003eTeleVue Telescope Eyepieces\u003c\/a\u003e and their clones have built-in Barlows - ample evidence that the lens is not some detrimental intruder.\" Thanks Terry, I couldn'''t agree more.\" --Al Nagler\u003c\/i\u003e\u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eTeleVue 2X BIG Barlow - 2\" Features...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cul\u003e\n\u003cli\u003eProduct design and execution deliver consummate satisfaction\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eFeatures include parfocal 1.25\" filter threads, captive lock screws that won't fall out and full multi-coatings\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eAll Tele Vue Barlows now use brass clamp rings for secure, non marring holding of eyepieces and accessories\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eMulti-coated high index glasses for optimum aberration correction, exceptional contrast with virtually no light loss\n\u003cp\u003e \u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003eEvery Tele Vue Barlow must pass the same rigorous f\/4, full field testing as all their eyepieces\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ccenter\u003e\n\u003ch2\u003eTeleVue 2X BIG Barlow - 2\" Specifications...\u003c\/h2\u003e\n\u003c\/center\u003e\n\u003cp\u003eOptics Type: 2X Barlow Lens\u003c\/p\u003e\n\u003cp\u003eBarrel Size: 2\"\u003c\/p\u003e\n\u003cp\u003eCoatings: Full multi-coatings\u003c\/p\u003e\n\u003cp\u003eWeight: 0.75 lbs.\u003c\/p\u003e\n\u003cp\u003eParfocal: Yes\u003c\/p\u003e\n\u003cp\u003eThreaded: Yes\u003c\/p\u003e\n\u003cp\u003eGlass Type: High Index\u003c\/p\u003e\n\u003cp\u003eWarranty: Limited Lifetime\u003c\/p\u003e\n\u003cp\u003eTeleVue Product Number: BWC-2211\u003c\/p\u003e","brand":"TeleVue","offers":[{"title":"Default","offer_id":41594873282673,"sku":"TEL-BWC-2211","price":233.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0851\/2766\/files\/BWC_2211_BigBarlow_2x_v3.jpg?v=1776459109","url":"https:\/\/khanscope.com\/en-fr\/products\/tele-vue-2x-big-barlow-2-bwc-2211","provider":"Khan Scope Centre","version":"1.0","type":"link"}