Tele Vue Optics Barlows:

Precision Engineered Magnification Tools

Advanced Design by Al Nagler: The Tele Vue Barlows, designed to complement the superior performance of Tele Vue eyepieces, employ a 2-element high-index glass to minimize aberrations in f/4 systems.
Eradicating the "Degrading Barlow" Myth: Recognized for improving telescope optics, these Barlows lay to rest the misconception of the Barlow as a detrimental component, as confirmed by Terrence Dickenson in Sky & Telescope (1997).
Enhancement Features: Tele Vue Barlows amplify power, slow the telescope's f/# (enhancing eyepiece sharpness), and compensate for eyepiece aberrations, delivering aberration-free performance even in f/4 scopes.
Superior Optical Quality: Multi-coated high-index glasses ensure exceptional contrast with minimal light loss, enhancing both Tele Vue and competitor eyepieces and telescopes.
Tele Vue's Commitment to Quality: Each Barlow undergoes rigorous f/4 full-field testing to meet the highest standards, featuring brass clamp rings for secure and non-marring holding.
1¼" Barlows Variety: Available in 2x and 3x magnifications, these Barlows offer parfocal-ization, 1¼" filter threads, captive lock screws, and full multi-coatings.
2" Big Barlow Specialization: Designed for Newtonian scopes, the 2x Big Barlow includes a 1¼" eyepiece adapter, 48mm filter threads, and full multi-coatings, ideal for this specific application.
Powermate™ vs. Barlow: While Barlows amplify power, they also extend eye relief and can cause vignetting in long focal length eyepieces. Tele Vue's Powermate™, a 4-element system, offers a superior alternative, providing pure magnification without the drawbacks of traditional Barlows.
Versatility and Compatibility: Compatible with a wide range of eyepieces and telescopes, the Tele Vue Barlows enhance the magnification and sharpness of your viewing experience.
Note on Big Barlow Usage: While offering unique benefits, it is advised not to use the Big Barlow with 2" diagonals due to potential parfocal issues. The 2" 2x Powermate (PMT-2200) is recommended for a broader range of applications without any compatibility issues.

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