Pentax XF 12mm 1.25" 60° Eyepiece

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Pentax XF 12mm 1.25" 60° Eyepiece

The 12 mm XF Series 1.25-Inch Pentax Telescope Eyepiece is a standard uni-focal eyepiece, offering a focal length of 12 mm, with a 60-degree apparent field-of-view and a long 18 mm of eye relief. These eyepieces feature an extendable eyepiece ring with four click-stop positions.

Compatible with the following: PF-65 and PF-65 ED II series spotting scopes, PF-80 series spotting scopes, PF-100 series spotting scopes


Pentax 12 mm XF Series 1.25-Inch Telescope Eyepiece Features

  • Designed for use with Pentax PF 65 Series Spotting Scopes, provides 20x to 60x magnification when used with them.
  • 60 degree apparent field of view
  • Rubber eyepiece ring designed for viewing comfort
  • Pentax SMC full-surface multi-layer coated optics reduce glare while providing maximum light transmission and color quality
  • High-refraction, low dispersion lanthanum glass to provide high resolution images with minimal aberrations
  • Advanced computer simulation design technology to reduce internal reflections, producing brighter, clearer images.
  • Weatherproof construction for greater durability.
Pentax Product Number: XF12



ER15mm to 19mm
Eye Relief18mm
Eyepiece TypeFixed
Field of View60 Degrees
Focal Length12mm
FoV 79 Degrees
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Customer Reviews
4.3 Based on 3 Reviews
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Peter B.
Superb in Some Areas

I purchased this eyepiece for an f6 telescope. What you get is excellent contrast and rich colors. The eyepiece was made for clusters like the Wild Duck. Planetary views show the subtlest details. Pentax, as usual, gets their coatings down. Less good is the edge definition. About 40% of the field is truly sharp.


I picked up one of these used, to give it a try. I allready have an older 12mm Type2 nagler, 12.4mm meade smoothside, and 12.5mm antares flat top orthoscopic in my collection. I found the comfort of the XF12 to be the best by a big margin. Suprisingly, despite more elements, the pentax was just as sharp and bright as either of the 2 planetary eyepieces, and noticeably brighter than the old nagler. The XF had slightly more scatter than the ortho, but much less than the nagler. It is a keeper! I will never be without a 12mm nagler (or possibly a 13mm ethos for deep space viewing with my Dob and TV101, but I will keep the XF for planetary and globular cluster viewing with my 8 ACF-R cassegrain and longer f8 4 refractor. A great EP at a great price!

Brad i.
Same as the 8.5mm

See my thoughts for the 8.5mm.