Tele Vue 2.0x 2 BIG Barlow (BWC-2211) Online now
Description
Tele Vue 2.0x 2 BIG Barlow
The Tele Vue 2.0x 2″ 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.
Note: The Big Barlow is not recommended for use with 2″ diagonals because it’s 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 Powermates page for a discussion of Powermates vs. Barlows.
Concept
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 & 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 Anyone telling you otherwise is using outdated information.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. — Al Nagler
Properly 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.
Tele 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 our competitor’s eyepieces and telescopes!
Tele Vue Quality
Compromise 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. All Tele Vue Barlows now use brass clamp rings for secure, non marring holding of eyepieces and accessories.
For astro-imagers, the above chart indicates the magnification for each Barlow (2x, 2x Big & 3x) as a function of distance from the Barlow top surface to the imaging surface (CCD or film).
Technical Specifications
Magnification: 2x
Barrel: 2″
Weight: 0.75 lbs
In the Box
Additional Information
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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 & 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. — Al Nagler
Properly 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.
Tele 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 our competitor’s eyepieces and telescopes!
Tele Vue Quality
Compromise 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. All Tele Vue Barlows now use brass clamp rings for secure, non marring holding of eyepieces and accessories.
For astro-imagers, the above chart indicates the magnification for each Barlow (2x, 2x Big & 3x) as a function of distance from the Barlow top surface to the imaging surface (CCD or film).Technical Specifications
Magnification: 2x
Barrel: 2″
Weight: 0.75 lbsIn the Box
Additional Information
Title Default Title
Related products
Tele Vue 5x 1.25 Powermate (PMT-5126) Online Hot Sale
Original price was: $327.00.$163.50Current price is: $163.50.Antares 2x 1.25 Twist-Lock Barlow (UB2TL) on Sale
Original price was: $88.00.$44.00Current price is: $44.00.Williiam Optics 2x Barlow nosepiece for Binoviewer (E-BINO-B2) Discount
Original price was: $63.00.$31.50Current price is: $31.50.Tele Vue 2.5x 1.25 Powermate (PMT-2513) Discount
Original price was: $327.00.$163.50Current price is: $163.50.Celestron X-CEL LX 1.25 2x Barlow Lens (93529) Supply
Original price was: $167.00.$83.50Current price is: $83.50.© 2023 Dexons Theme. All rights reserved.
We using safe payment forflowsynapseus.shop © 2025 All Rights Reserved
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