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Televue 4X Powermate - 2"
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Televue Power Mate 4X Image Amplifier PMT-4201 accepts all 2" eyepieces and accessories and comes with an additional 1.25" adapter!
- Incorporates a "positive" and "negative" doublet for better optical correction.
- Higher magnifications are possible with high optical performance compared to "doubling up" Barlows.
- Televue Power Mate 4X Image Amplifier PMT-4201 delivers high performance for CCD or film!
- Accepts Televue's T-Ring Adapter (PTR-4201) for close coupling to cameras and CCD imagers.
- Ideal for Hydrogen-alpha filter use such as with Daystar models.
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Televue 4X Powermate Image Amplifier - 2"
"While Barlows are powerful tools, the negative element defining
them also limits their ability. The simple negative element Barlow
increases eyepiece eye-relief. With short focal length eyepieces the
effect is negligible. However, on long focal length eyepieces the exit
pupil position moves well beyond the designer's intended position,
resulting in vignetting with many eyepieces. This is why "Shorty"
Barlows in particular, with their strong negative element often
vignette and degrade long focus eyepieces. My 4-element form picks up
where the Barlow concept can go no further. Powermate™ is a
technically universal solution, using a positive field lens to
redirect field rays. The result is an exit pupil that stays where the
eyepiece designer intended. With freedom from aberrations, greater
magnification potential, and compact size, I hope you'll agree
Powermate™ raises the standard for image amplification." - Al
Nagler
The new Televue 4X Powermate PMT-4201 is 4-element concept which continues
the tradition of full-field sharpness with optimum aberration control.
Are you looking for long eye-relief? The Televue PMT-4201 retains the
eye-relief of long focal length eyepieces, while at high power... a
bonus for all eyeglass wearers! What makes it special? The Tele Vue
Power Mate™ consists of a negative doublet plus a positive
"pupil-correcting" doublet. This 4-element system provides the
magnifying function of a barlow without its limitations by restoring
the field rays back to their original direction... as if the Power
Mate wasn't there. The result is a pure magnification increase! The
4X Televue PMT-4201 is flexible for visual and imaging with all
types of telescopes and eyepieces. Essentially parfocal, the Televue
PMT-4201 PowerMate delivers nearly constant magnification regardless
of image distance behind top surface. Vignetting, edge field
aberrations and pupil movement are minimized. No special interface is needed!
For astro-imagers, check the "Additional Images" tab for a chart which
indicates the magnification as a function of distance from the Televue
Powermate™ top surface to the imaging surface (CCD or film). Some of
the finest Solar System images on this world have been made with
Televue Powermates! Used singly or stacked, they help any scope
achieve the long focal-length required to image details on the planets
or solar surface. The increased image scale allows for imaging without
an intervening eyepiece -- like in prime focus photography.
Televue 4X Powermate Image Amplifier
Features...
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Four element design delivers full-field sharpness with optimum
aberration control.
- Retains the eye-relief of long focal length eyepieces while
delivering high power.
- Flexible for visual and imaging with all types of telescopes
and eyepieces.
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4X - 2" Power Mate weighs 22 ounces.
- One year Televue warranty.
Televue Product Number: PMT-4201
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.
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