Tele Vue 4X Powermate image amplifier for 2" eyepieces, with 1.25" eyepiece adapter

$332.01

Availability: In stock

If you need a very high quality, very high power 4x Barlow for 2" eyepieces, look no further than this TeleVue Powermate. While not technically a Barlow, this unique new 4-lens 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 increasi . . .


Our Product #: 9140C
TeleVue Product #: PMT-4201
Recommended Accessories
 

Product Description

If you need a very high quality, very high power 4x Barlow for 2" eyepieces, look no further than this TeleVue Powermate. While not technically a Barlow, this unique new 4-lens 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 compact 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. No additional "interface lens" is needed, since the Powermate already has it built-in.

The Powermate is fully multicoated, with blackened lens edges and internal antireflection threading for excellent contrast. There's an undercut safety groove in the barrel that helps hold the Powermate in place should the focuser thumbscrew accidentally loosen. The Powermate is threaded to hold 48mm filters. It is 5.25" in length, but the chrome barrel is only 1.5" long, allowing use of the Powermate in star diagonals. Both the 2" eyepiece holder and the supplied low-profile 2" to 1.25" eyepiece adapter use brass clamp rings for secure, non-marring operation. A captive thumbscrew in the Powermate (that can't be lost in the field) operates its clamp ring.

It is optically corrected down to f/4 for use with fast f/ratio reflectors, but does not correct the coma inherent in such scopes. If used with the 2" Paracorr in fast focal ratio reflectors, the Powermate should go into the focuser first, with the Paracorr being inserted into the Powermate body.

An optional T-ring adapter, #9140T, is available to allow the 2x Powermate to be used for lunar and terrestrial photography with short focal length refractors.

Tech Details

Barrel Size 2"
Length 5.25"
Number of optical elements 4
Power 4x
Weight 22 oz
Warranty 1 year

Reviews

Review by:
TeleVue products are simply the best, and my Powermates are no exception. This 4X provides me with not only amazing images of the moon and sun, but also when observing. I use this on my 80mm refractor and Celestron 8HD Edge. (Posted on 7/22/2019)
Review by:
The TeleVue Powermate was one of the best purchases I have ever made in this hobby. Excellent for high-power planetary viewing. Amazing optics. Much better than a standard barlow. On good nights this was indispensable for planetary viewing thru a refractor or a cassegrain. No matter what scope you have, if you need that extra ooomph, this will be a fine addition to your arsenal. A must have in my opinion. (Posted on 12/3/2018)
Review by:
This is and an amazing Barlow. I have has this since 2009 and use it all the time. I was amazed by the fact that it will correct aberrations in sub par eyepieces. So even my inexpensive William's wide fields look like Televue's wide fields. You wont be disappointed. (Posted on 10/10/2018)
How do you rate this product? *
Rating