Televue 2.5X Powermate Image Amplifier
"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 Televue 2.5X Powermate 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-2513 retains the eye-relief of long focal length eyepieces, while at high power... a bonus for all eyeglass wearers! What makes it special? The Televue 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 2.5X Televue PMT-2513 is flexible for visual and imaging with all types of telescopes and eyepieces. Essentially parfocal, the Televue PowerMate delivers nearly constant magnification regardless of image distance behind top surface. Vignetting, edge field aberrations and pupil movement are minimized.
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 2.5X Powermate Image Amplifier Features
- 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.
- 2.5X Power Mate weighs only 0.45lb!
- Five year Televue warranty.
- Additional Information
SKU TE-PMT-2513 Barrel Size 1.25" Magnification 2.5X Manufacturer Tele Vue Warranty Lifetime Warranty
Customer Reviews 1 item(s)
- invisible element
This powermate is great, it increases the power, ONLY the power, same crisp image, same contrast (of course more power = less ligth.
My 13mm Nagler turned into a 5mm Nagler, high power with grat eye relief.
With this powermate you can realy push to the limit magnification of your telescope.
It is like is not there, realy is invisible.
1= Houston, We Have a Problem & 5= It's Out of This World
- Included Items
- 2.5X PowerMate
- Protective Caps
- Five Year Televue Warranty
- Questions & Answers
Product QuestionsHi Chris,
Firstly, many thanks for your Dawes' Limit Cheat Sheet and the chart for matching focal length to camera, etc. I've been a deep sky imager for years, and would like to venture into planetary and lunar imaging (why it took so long, I haven't a clue.) If I'm doing my math correctly, the best match for shooting with an 11" Celestron EdgeHD at f/10 would be the Tele Vue Powermate 2.5X and a Skyris 618C. If you could give me a thumbs-up or down on this choice, I'd appreciate it. I've not used any sort of multiple-frame camera before, and the upper-scale Point Grey cameras are a bit out of budget, so have been looking at reviews of the Skyris and others. Thanks again.Question by: Steve Solon on Jun 8, 2015 11:24:00 PM
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