Tele Vue 2X BIG Barlow - 2"
Televue 2X BIG Barlow - 2"
"Properly designed Barlows do wonderful things. First, they amplify power while retaining the eyepiece's eye-relief. Second, they slow the telescope's f/ratio which improves eyepiece sharpness. Third, the designer can introduce compensations for eyepiece aberrations. Televue's 2" 2x BIG Barlow was envisioned as a magnification window. Multi-coated high index glasses assure optimum aberration correction, exceptional contrast and virtually no light loss. Televue Barlows achieve their design goals even when tested by the fastest scopes. They even improve our competitor's eyepieces and telescopes!" --Al Nagler
For eyeglass wearers, the Big Barlow is perfect for doubling the power while retaining the eye-relief of 2" Televue eyepieces such as the 55mm Plossl, 35mm and 27mm Panoptics (requires use of Panoptics Barlow Interface) and 20mm Nagler Type 2. The TeleVue 2X BIG Barlow is also threaded for 48mm filters and has a captive lock-screw. The brass clamp rings hold 2" eyepieces (or the supplied 1-1/4" adapter) snugly in place...a nice design upgrade! At only 4.5" long, the BIG Barlow can be used in most 2" diagonals or placed in the focuser in before the star diagonal for additional magnification. While this isn't possible with all refractors, the 2" focuser on TeleVue models require an extension tube to achieve focus. When used in this manner, the magnification increases to 3.3X.
Televue 2X BIG Barlow - 2" Features
- Keep your eye relief and enjoy higher magnification!
- Anti-reflection threaded, with blackened lens edges for high contrast.
- TeleVue BIG barlow weighs 15 ounces and measures 4.5" long.
- Five year Televue Warranty
Using the Big Barlow with 27mm and 35mm Panoptic eyepieces requires an optional Televue Big Barlow Panoptic Interface [TE-EPO-INT] (sold under the "Accessories" tab) to maintain eye relief, avoid vignetting, and improve the field edge performance.
All Televue products are available to ship world-wide from OPT, and effective July 1, 2008, are covered by a Five Year Worldwide Limited Product Warranty! Always be sure to save your original packaging materials should you need to return any Televue product for warranty or repair.
Questions & AnswersAsk a Question
This product indicates it needs a Panoptic interface for use with the Panoptic Tele Vue eyepieces, but I am unable to find that on the site (at the reference link). Can you clarify what is needed?
Unfortunately, TeleVue no longer makes the Panoptic Barlow Interface, so your best bet when using Panoptic eyepieces is to use a Powermate instead of a 2" barlow.