Tele Vue 2.5X Powermate image amplifier for 1.25" eyepieces

$217.01

Availability: In stock

While not technically a Barlow, this unique new 4-lens 2.5x image amplifier performs the same functions, but at a higher level of optical correction. Barlow lenses have a negative power that diverges field rays, lengthening the effective focal length of the telescope and increasing the magnification. If Barlows are made too short or with too much magnification, the diverging rays can cause severe . . .
Our Product #: 7625T
TeleVue Product #: PMT-2513
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Product Description

While not technically a Barlow, this unique new 4-lens 2.5x image amplifier performs the same functions, but at a higher level of optical correction. Barlow lenses have a negative power that diverges field rays, lengthening the effective focal length of the telescope and increasing the magnification. If Barlows are made too short or with too much magnification, the diverging rays can cause severe vignetting and image degradation in eyepieces due to mismatched pupils.

The Powermate is a 4-element parfocal amplifying lens system that consists of a negative achromatic doublet (a Barlow) plus a positive "pupil-correcting" doublet. While it looks and functions like a Barlow, your eyepieces will operate with pupil locations where the eyepiece designer intended, avoiding vignetting and mismatch problems with wide field eyepieces. The Powermate optimally mates its power to your eyepieces.

It is fully multicoated, with blackened lens edges and internal antireflection threading for excellent contrast. Due to its mechanical design, its barrel is not threaded for eyepiece filters. There's an undercut safety groove in the barrel that helps hold the Powermate in place should the focuser thumbscrew accidentally loosen. A non-marring brass clamp ring (with a captive thumbscrew that can't be lost in the field) holds your eyepieces securely in place. The Powermate is 3.8" long, with a short chrome barrel that allows it to be used in star diagonals.

This TeleVue is parfocal with TeleVue Plössls below 32mm in focal length, so you won't have to do any major refocusing as you change from an eyepiece alone to an eyepiece/Powermate combination. It is optically corrected down to f/4 for use with fast f/ratio reflectors, but will provide excellent performance with any telescope type or focal ratio. It is parfocal with the 1.25" diagonal of the TeleVue Ranger for quick power changes during terrestrial observing.

The chrome barrel containing the Powermate's optics can be removed from the black eyepiece holder section and used for lunar and terrestrial photography with close coupling cameras or CCD imagers. It is particularly useful for increasing the photographic magnification with short focal length refractors. An optional T-ring adapter, #81PMT, is needed to connect the chrome optical portion of the Powermate with a camera or CCD imager.

Tech Details

Barrel Size 1.25"
Length 3.8"
Number of optical elements 4
Power 2x
Weight 6 oz
Warranty 5 years

Reviews

Review by:
This has been a great "Image Amplifier" (Barlow). Provides sharp and clear images. The 1.25" 2.5x Tele Vue Powermate has been well worth the purchase. Spend the money, you won't regret it and it will last a lifetime. Now I need to get an adapter for my Canon to see what it can do for imaging. (Posted on 10/5/2019)
Review by:
Powermates work very well and are optically very good. (Posted on 12/31/2018)
Review by:
Used as a photographic accessory to increase the telescope's EFL, it works superbly.
Visually, there seems to be some image compromise compared to going with an eyepiece with a native FL about 1/2.5 of the Powermate'd EP. For example, I get a sharper and contrastier image with a Pentax XW 5mm, than with a 2.5X Powermate combined with a 13mm Nagler T6 or an Astro-Tech 12.5mm High Grade Plossl. (Posted on 11/26/2018)
Review by:
Exceptional quality and very comfortable to use. The best part about it is that it doesn't alter the eye relief of any of my LER eyepieces at all. This is something a normal barlow cannot do. (Posted on 11/21/2018)
Review by:
Simply put this powermate just gets out of your way optically. The 2.5 power makes it very versatile without having multiples of eyepieces. Mechanically it is extremely solid.Money well spent!! (Posted on 11/16/2018)
Review by:
As you can see by the other reviews I'm sure, this is an amazing product. Without question one of the best purchases I've ever made for my scope. Amazing optics and FAR better than a standard Barlow. Pricey, but you get what you pay for. This will not sit unused on your shelf. On nights of good seeing, whether for visual or astrophotography, the Powermate is in my opinion an indispensable addition to my AP toolkit for planetary and lunar imaging. Get one now! (Posted on 10/28/2018)
Review by:
Yes, the PowerMates are a bit on the pricey side ... but boy do they perform! Very happy with the detail in the planetary images this little beauty has allowed me to capture.

If using it for imaging, I highly recommend the matching Tele Vue T-ring adapter - gives a rock-solid connection to your planetary camera. (Posted on 10/18/2018)
Review by:
I use this when I need higher power with my TEC 140. My shortest focal length eyepiece is 4.7 mm so I use the Powermate when I need to reach shorter than 4.7 mm. The quality of the views through this Powermate are excellent. I can not detect any image degradation. (Posted on 10/6/2018)
Review by:
The 1.25" 2.5x Tele Vue Powermate "Image Amplifier" is an exceptional product that delivers exactly what is promised. Solid construction and flexibility for visual and imaging with all types of scopes and eyepieces make this unit an excellent value, I particularly like the captive lock screw that can’t fall out and get lost. The Powermate magnifies without distortion, a significant improvement in the view over a regular Barlow lens. Compared to a regular Barlow the contrast is noticeably higher, with no evidence of scattered light, edge of field abortions or lateral color. The detail of both Saturn and Jupiter is noticeably sharper than a regular Barlow and the detail of both planets seems to pop out at you. Lunar viewing is exceptionally sharp and clear. The Tel Vue Powermate has replaced my standard Barlow. If you have been considering a new Barlow you would be well advised to go “all in” and get a Powermate instead, you will not be disappointed! (Posted on 10/6/2018)
Review by:
To get more mileage from my eyepieces I bought a 'short' Barlow of a brand not sold by Astronomics. Bad idea -- it was a disappointment, with unsharp images, even under good seeing conditions.

So about a year ago I upgraded to the Televue Powermate 2.5. A 2x would have been better, but the Powermate only comes in 2.5 and 5x powers.

It's great; there's no essential difference between a good eyepiece plus the Powermate and a similar power eyepiece. A second benefit is that with the Powermate I don't have to use very short focal length eyepieces with tiny openings. This is handy for public star parties because people often have trouble finding the image with small eyepieces. (Posted on 8/4/2017)
Review by:
The 1.25" 2.5x Tele Vue Powermate "Image Amplifier" is an exceptional product that delivers exactly what is promised. Solid construction and flexibility for visual and imaging with all types of scopes and eyepieces make this unit an excellent value, I particularly like the captive lock screw that can't fall out and get lost. The Powermate magnifies without distortion, a significant improvement in the view over a regular Barlow lens. Compared to a regular Barlow the contrast is noticeably higher, with no evidence of scattered light, edge of field abortions or lateral color. The detail of both Saturn and Jupiter is noticeably sharper than a regular Barlow and the detail of both planets seems to pop out at you. Lunar viewing is exceptionally sharp and clear. The Tel Vue Powermate has replaced my standard Barlow. If you have been considering a new Barlow you would be well advised to go "all in" and get a Powermate instead, you will not be disappointed! (Posted on 8/4/2017)
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