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Tele Vue Barlows & Powermates

Tele Vue Optics, Inc.
Chester, NY 10918
United States
845.469.4551 Eastern Time (Main Phone)
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● Tele Vue Barlows
A high quality Barlow must be properly designed and manufactured in order to avoid compromising a telescope's color and spherical aberration corrections. Tele Vue’s Barlow design was developed to complement the high performance of our eyepieces. They feature 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. The "invisibility" of Tele Vue's 2-element Barlows has been noted in test reports in the astronomy magazines. They even improve our competitor's eyepieces and telescopes!

• 1¼" Barlows are offered in 2x and 3x magnifications, are parfocal, and perform with identical quality

• 2" Big Barlow is offered in a 2x magnification and is ideal for Newtonian scope owners. It will be parfocal with both 2" and 1¼" eyepieces in this application and features an 1¼" eyepiece adapter.

● Tele Vue Powermates™
While Barlows are powerful tools, the negative element defining them increases eyepiece eye-relief and possible vignetting. With short focal length eyepieces the effect is negligible. However, on long focal length eyepieces the exit pupil position moves well beyond the intended position. The 4-element Powermate™ picks up where the Barlow concept can go no further, using a positive field lens to redirect field rays. The result is a “pure” magnification increase with freedom from aberrations, vignetting, greater magnification potential, compact size and an exit pupil that stays where the eyepiece designer intended. Enjoy the sharpness and comfort of the 32mm Plössl at up to 5 times the power! Also, with field rays leaving parallel to the optical axis, Powermates™ are ideal for Hydrogen-alpha filter use.

Some of the finest Solar System images have been made with Powermates™. Powermates™ feature nearly constant magnification regardless of image distance behind top surface (except 5x model which increases 1x for every 35mm of image distance increase). Powermate T-Ring Adapters fit on the Powermate lens assemblies to allow attachment of your camera's T-Ring or other T-threaded imaging accessory. Used singly or stacked, Powermates™ help any scope achieve the long focal-length required to image details on Solar System bodies.

• 1¼" Powermates™ are offered in 2.5x and 5x magnification. They stand less than 3" out of your focuser and are parfocal in 1¼" diagonals and prisms

• 2" Powermates™ are offered in 2x and 4x magnification to gain higher power with typically long focal length 2" eyepieces. They include 1¼" adapters. They require far less refocusing compared to 2" Barlows when used in Star Diagonals

All Tele Vue Barlows and Powermates use brass clamp rings for secure, non-marring holding of eyepieces and accessories, have filter threads, captive lock screw and full multi-coatings. All must pass the same rigorous f/4, full field testing as our eyepieces.

We are pleased to offer a Lifetime Limited Warranty on all Barlows and Powermates (see details on our website). You also have the security of knowing that every current Tele Vue Barlow and Powermate can be repaired, serviced, or cleaned at the factory.

Click "Visit Website" under product image for more info and “Where to Buy”.
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