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TeleVue 2.5x 1.25

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TeleVue 2.5x 1.25

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2 customer reviews

Price: $229.00

  • Manufacturer: TeleVue
  • UPC: PMT2513
  • MPN: PMT-2513
  • SKU: PMT-2513
  • Availability: In Stock

TeleVue Powermate 2.5x 1.25" T-Ring ready.
  

I thought you might be interested in the development of this project:  Barlows amplify the power of a telescope. They can be considered "focal reducers" for eyepieces, or "focal extenders" for objectives.
  

Terence Dickenson, in his Barlow test report in Sky and Telescope, July 1997, says: "Technology has erased the old objections. A modern Barlow will not degrade your telescope`s optics. Anyone telling you otherwise is using outdated information. Moreover, the highly regarded Nagler eyepieces and their clones have built-in Barlows, ample evidence that the lens is not some detrimental intruder." Thanks, Terence, for laying the myth of the degrading Barlow to rest.
  

Barlows do more than just increase magnification; they also retain eye relief (or in the case of long focal length eyepieces, actually INCREASE eye relief). A high quality Barlow must be properly designed and manufactured in order to avoid compromising a telescope`s color correction and spherical aberration correction. The "invisibility" of Tele Vue`s 2-element Barlows have been noted in test reports in the astronomy magazines.


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Most Helpful Customer Reviews

Beats a Barlow by a bunch!

By Philip Canard on October, 17th 2009

I have a Meade LXD75 SN8 and use Omni Plossl EPs. The edges were soft on the Plossls near the field stops, so I decided to try a 2.5X Powermate and slow the OTA down to f/10. I had not had much luck with an Omni 2X Barlow, as things just got worse and the longer EPs became useless with way too much eye relief. The Powermate produced excellent results with all EPs down to 6mm. The 4mm has an exit pupil too small to be useful when used with the Powermate, but thats just the laws of physics at work. Now all my EPs are sharp to the edge and color correction is even better than before. I can now achieve magnifications up to 338X with my 8 f/4 scope. I easily split the double double in Lyra last night at 169X. I could easily see black space between the stars. Only the seeing conditions now limit me on my magnification. On deep sky objects, the background stays black and contrasty. There is very little light loss introduced by the Powermate.

1.25 2.5X Powermate for imaging

By Roy Hoskin on October, 17th 2009

I had been searching for a solution to imaging with my new olympus E-510 and a coronado PST CAK telescope and had gone through many different solutions without much satisfaction. The PST has a very limited back focus making imaging difficult, and getting the image size appropriate on the camera sensor was difficult. Using the 2.5x powermate with the t-ring adapter gave me a perfectly sized and sharp image with enough backfocus to add an additional K-line filter between the powermate and the PST to further narrow the spectral resolution.

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