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Pentax SMC XF 8.5mm Eyepiece (1.25")

B&H # PEEP8.5X Mfr # 70531
In Stock
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You Pay: $139.95
Product Highlights
  • For Any Scope Using 1.25" Eyepieces
  • Waterproof & Fogproof
  • Wide Angle
  • 46x with 65mm Pentax Scopes
  • 58x with 80mm Pentax Scopes
  • 74x with 100mm Pentax Scopes
  • 18mm Eye Relief
  • 60° Apparent Field of View

Pentax premium spotting scopes adhere to the American standard of 1.25" eyepiece thread diameter, facilitating the use of eyepieces from independent manufacturers.  That also means, of course, that the wonderful Pentax eyepieces can be used in other telescopes and spotting scopes which accept 1.25" eyepieces.

Pentax eyepieces are a near consensus choice amongst serious amateur and professional astronomers as the best that's out there, quite an accomplishment indeed given the fervent passion of the collective.

The XF lineup are less costly options which were designed for the PF-65ED and PF-65EDA midsized class of spotting scopes and their somewhat shorter focal length of 390mm.  They can be used with any Pentax spotting scope, as well as with other telescopes which accept the standardized 1.25" eyepieces.  The XF eyepieces are meet the J.I.S. "Class 4" standard for waterproofing, described by the Japanese regulators as "water splashed against the enclosure from any direction shall have no harmful effects".

Helicoid-type eyecup with four detented click-stop positions
Parfocal with the XF 12 eyepiece, requiring no focus readjustments when exchanging the two
Accepts 1.25" filters for astronomical & terrestrial applications
Magnification 46x (with the PF-65ED)
Angle of View 1.3° (with the PF-65ED)
Field-of-View (@ 1000 Yds) 66' (22 m at 1000 m)
(with the PF-65ED)
Exit Pupil Diameter 1.4mm (with the PF-65ED)
Eye Relief 18.0mm
Relative Brightness 2.0 (with the PF-65ED)
Twilight Factor 54.6 (with the PF-65ED)
Weatherproofing Water resistant
Dimensions 1.7 x 3.3" (43 x 83mm) WxH
Weight 0.33 lb (150 g)
Pentax SMC XF 8.5mm Eyepiece (1.25")
  • Push-On Front & Rear Caps
  • Limited Lifetime Warranty
  • REVIEW SNAPSHOT®

    by PowerReviews
    PentaxSMC XF 8.5mm Eyepiece (1.25")
     
    4.5

    (based on 2 reviews)

    Ratings Distribution

    • 5 Stars

       

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    Reviewed by 2 customers

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    5.0

    Pentax XF8.5mm

    By Kitch

    from Australia

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Compact design
    • Excellent Eyecup
    • Excellent Eye-relief 18mm
    • No Field Curvature
    • No Lateral Colour
    • Very sharp

    Cons

      Best Uses

        Comments about Pentax SMC XF 8.5mm Eyepiece (1.25"):

        I was very keen to try out this eyepiece after reading quite a bit about it.
        I have not had much time to do any comprehensive testing .....here are my initial thoughts:

        Tested in Takahashi FS60CB F5.9 at 355mm f/l and Takahashi TSA120 F7.5 at 900mm f/l on the Great Nebula in Orion (Messier 42) and compared with the beautiful Vixen Lanthanum LVW 8mm, the Pentax is very sharp and shows great contrast. The sharpness extends across the field of view with almost no lateral colour visible in either Takahashi scope. The star images were a little tighter in the Pentax than the Vixen.

        The XF8.5 is a very well made, compact eyepiece.

        • Was this a gift?:
        • No

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        4.0

        Easy to use eyepiece

        By Jim

        from Boligee, AL

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Adjustable eyecup
        • Decent field of view
        • light and compact
        • Long eye relief
        • Well baffled

        Cons

          Best Uses

          • With binoviewers
          • With field scope

          Comments about Pentax SMC XF 8.5mm Eyepiece (1.25"):

          I purchased a pair of these to use with a Baader binoviewer and a small SCT scope with a 0.63 FL reducer (to reduce magnification and widen the field). Their eye relief and turn to raise eyecup are both beneficial. In comparing them to a pair of simiar focal length orthoscopic eyepieces,they seem to not have quite the brightness or contrast, but have a wider field of view and obviously much longer eye relief.
          Overall, I am pleased with them, but wish that Pentax had a few more focal lengths in this range to chose from than this and the 12mm.
          If you have not tried using binoviewers, I would encourage you to do so. To me, they are much more enjoyable to use for low to medium magnification on planets, binaries and clusters than a monocular.

          • Was this a gift?:
          • No

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