2.5X Powermate image amplifier for 1.25" eyepieces

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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.

Power:
2x
Number of optical elements:
4
Barrel Size:
The industry standard diameter, as of 2011, is 1.25" and is the most common.  Other sizes available are .965" and 2".
1.25"
Length:
3.8"
Weight:
The weight of this product.
6 oz
Warranty:
5 years
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Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(5.00)   # of Ratings: 2   (Only registered customers can rate)

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1. Denis on 5/30/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
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.
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2. Bill on 4/30/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
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!
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TeleVue - 2.5X Powermate image amplifier for 1.25" eyepieces

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TeleVue - 2.5X Powermate image amplifier for 1.25" eyepieces
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 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 5.00 | Users: 2)  Only registered users can submit ratings - Register Here
Our Product #: 7625T
Manufacturer Product #: PMT-2513
Price: $215.00
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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 . . .





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