Tele Vue Barlows use multi-coated high index glasses for optimum aberration correction, exceptional contrast with virtually no light loss. Available in 2X or 3X. Parfocal with eyepieces--has 1¼" filter threads.
- 3x Barlow 1¼" / 0.40lbs
- High Index of refraction glass
- Good to f/4 and below
- Compression ring binding
- Parfocal with eyepieces
Concept: TeleVue 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 Anyone telling you otherwise is using outdated information.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.
Offered 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.
2" Big Barlow
Offered 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.
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), which essentially includes the Pan-Barlow Interface (see Accessories tab). See the Powermates pages for a discussion of Powermates vs. Barlows.
TeleVue eyepieces, Barlows, PowerMates, and Paracorr are warranted to be free from manufacturing and workmanship defects for lifetime from the date of purchase. This warranty applies to the original purchaser and is not transferable. Defects covered under this warranty are limited to optical coating and cementing, and normal mechanical operation of the product. The warranty does not include damage caused by mishandling, alteration, normal wear and tear from use, defects of a subjective nature, or coverage for any product not purchased through an authorized TeleVue dealer.
The original owner must complete a warranty registration card and send it to TeleVue Optics for the warranty to be valid, unless state law supersedes. In such case, or if warranty cards are not submitted, an original dated sales receipt containing the original purchaser's name will serve as proof of purchase for registration.
If your TeleVue eyepiece, Barlow, PowerMate, or Paracorr requires warranty service, please call TeleVue at (845)469-4551 to discuss the problem and obtain a return authorization. No returns are accepted without prior authorization.
Warranty work will be performed at TeleVue's discretion and may ONLY be performed by TeleVue Optics. Warranty is void if work is performed on your product by anyone other than TeleVue Optics. TeleVue Optics reserves the right to assign warranty service to Authorized Service Centers. In the event a product cannot be serviced, TeleVue will replace the defective product with a current equivalent. All shipping and insurance charges are excluded from this warranty.
This warranty gives you specific legal rights. You may be entitled to other rights which vary from state to state. For warranty coverage outside the United States, contact your local TeleVue authorized dealer for warranty information. You may have other rights which vary from country to country.
TeleVue does not assume liability for any other warranty, expressed or implied, made by any other entity.
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