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Eyepieces

Not Exact? ..... Exactly

Posted by David Russell 07/12/2016 12:00AM (Reviews/Eyepieces/Other)

Eyepiece AFOV and Barlow magnification factors can effectively vary from manufacturer specified values.

A Review of 1.25" 32mm Eyepieces

Posted by David Russell 07/22/2014 12:00AM (Reviews/Eyepieces/12mm-And-Up)

The 32mm 1.25” plossl is one of a handful of available eyepieces that offers the maximum possible TFOV in the 1.25” format. However, reviews of the various 32mm 1.25” options are hard to find. With that in mind I gathered a sample of five different 32mm 1.25” eyepieces currently in production and added the 35mm 1.25” Orion Ultrascopic to the sample.

A review of the 20mm ES68, 20mm Pentax XW, and 20mm Waterproof Meade UWA

Posted by David Russell 07/07/2013 12:00AM (Reviews/Eyepieces/12mm-And-Up)

The eyepiece market provides numerous options with a 20mm focal length ranging from inexpensive 20mm plossls to expensive “premium” options offered by Pentax and Televue. Eyepieces with a 20mm FL are very versatile giving exit pupils ranging from 4.4mm to 2.0mm with scopes having focal ratios from F/4.5 to F/10...

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Telescopes, Astronomy, Binoculars