{"product_id":"used-tele-vue-2-5x-barlow-1-1-10","title":"Vintage Tele Vue 2.5x Barlow 1 1\/4\"","description":"\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e This is a used original type 2.5x 1.25\" Tele Vue Barlow.  It is in good condition, showing some signs of use, and has relatively clean optics.  However, it does have a spot in its coatings.  See the photos.  We have taken these condition issues into consideration with the pricing. \u003c\/p\u003e\n\u003cp\u003eIt has the original box, but no dust covers.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch5\u003e\u003cbr\u003e\u003c\/h5\u003e\n\u003ch5\u003eDescription\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003e\u003c\/strong\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eTele Vue Barlows reduce aberrations to below the airy disc in an f\/4 system and lay to rest the popular myth of the \"degrading Barlow.\"\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eProperly designed Barlows do wonderful things: They amplify power, slow the telescope's f\/# (improving eyepiece sharpness), and give designers the opportunity to compensate for eyepiece aberrations.\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003eTele Vue Barlows 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 scopes. They even improve eyepieces and telescopes in non TeleVue brands!\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\u003cstrong\u003eTele Vue Quality\u003c\/strong\u003e\u003c\/div\u003e\n\u003cp\u003eCompromise image quality in any part of the optical chain and you've compromised every part! Tele Vue product design and execution deliver consummate satisfaction. Every Tele Vue Barlow must pass the same rigorous f\/4, full field testing as all our eyepieces.\u003cspan\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\u003cstrong\u003e1¼\"Barlows\u003c\/strong\u003e\u003c\/div\u003e\n\u003cp\u003eOffered in 2x and 3x magnifications, these 1¼\" Barlows perform identically. Simply choose either or both based on your eyepiece collection. Features include parfocal-ization, 1¼\" filter threads, captive lock screws that won't fall out and full multicoatings. \u003c\/p\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\u003cstrong\u003e2\" Big Barlow\u003c\/strong\u003e\u003c\/div\u003e\n\u003cp\u003eOffered in a 2x magnification, the Big Barlow is ideal for Newtonian scope owners. It will be parfocal with both 2\" and 1¼\" eyepieces in this application. Features include 1¼\" eyepiece adapter, threads for 48mm filters, captive lock screw and full multi-coatings.\u003c\/p\u003e\n\u003cp\u003eNote: The Big Barlow is\u003cspan\u003e \u003c\/span\u003e\u003cu\u003enot\u003c\/u\u003e\u003cspan\u003e \u003c\/span\u003erecommended for use with 2\" diagonals because its length prevents it from being parfocal. With some telescopes, focus might not be reached, particularly when the interface lens is also used with it. A far better approach with no potential problems in any scope or with any eyepieces is to use the 2\" 2x Powermate (PMT-2200). See the\u003cspan\u003e \u003c\/span\u003e\u003ca href=\"http:\/\/www.televue.com\/engine\/TV3b_page.asp?id=53\"\u003ePowermates\u003c\/a\u003e\u003cspan\u003e \u003c\/span\u003epage for a discussion of Powermates vs. Barlows.\u003c\/p\u003e\n\u003cp\u003eAl Nagler discusses Barlows: \"I originally designed the Tele Vue Barlow line to complement the high performance of our eyepieces. 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 Barlow will not degrade your telescope's optics. Anyone telling you otherwise is using outdated information. Moreover, the highly regarded Nagler eyepieces and their clones have built-in Barlows - ample evidence that the lens is not some detrimental intruder.' Thanks Terry, I couldn't agree more.\"\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\n\u003cstrong\u003e\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"OnBannerCap OnBannerFont\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"OnBannerCap OnBannerFont\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch5\u003eSpecifications\u003c\/h5\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable id=\"prodSpecTbl\"\u003e\n\u003ccaption\u003e Barlows (size\/weight-lbs) \u003c\/caption\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd class=\"rowHead\"\u003e2.5x Barlow\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e1¼\" \/ 0.30\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv class=\"pageSectionTitle\"\u003e\n\u003cmeta charset=\"utf-8\"\u003e \u003cbr\u003e\n\u003c\/div\u003e\n\u003ch5 class=\"pageSectionTitle\"\u003e\u003cbr\u003e\u003c\/h5\u003e","brand":"Tele Vue","offers":[{"title":"Default Title","offer_id":48275849969923,"sku":"U2605-DZ-BLW-25125","price":75.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1979\/5379\/files\/original-572.jpg?v=1779994734","url":"https:\/\/milehighastro.com\/products\/used-tele-vue-2-5x-barlow-1-1-10","provider":"Mile High Astronomy","version":"1.0","type":"link"}