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Pentax PF-CA35 K-Mount SLR Camera Adapter

B&H # PECA MFR # 70510
Pentax PF-CA35 K-Mount SLR Camera Adapter

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Product Highlights

  • Only for Pentax Spotting Scopes
  • Fits All K-Mount SLR/DSLR Cameras
  • Fixed f/12.5 Aperture

You Pay: $325.38

Questions? Ask our experts:

The Pentax PF-CA35 allows photography using Pentax K-mount 35mm & digital SLR cameras with the fabulous line of 65mm, 80mm & 100mm spotting scopes.  It is not used in conjunction with an eyepiece, but rather you remove the eyepiece and attach this device where the eyepiece would normally attach to the spotting scope.  You then attach your K-mount camera to the side of this device which is not screwed into the spotting scope & you're ready to shoot.

All ventures in the world of telescope photography require the use of a sturdy tripod, first and foremost.  Logical choices for a tripod/head combination are indicated here as accessories, with an ascending order in price & support.  You must take great care to keep vibrations during exposure to an absolute minimum.  Employing a cable release, electronic release or remote control for tripping the shutter is absolutely necessary.  And while it is not necessary per se, a mounting bracket will do wonders to reduce vibrations of your rig.

Note: Your camera will need to be in fully manual exposure mode, although some Pentax cameras may also work in aperture-priority autoexposure mode.  Additionally, the switch on the camera which chooses the focus mode must indicate manual focusing.

Five fully multicoated lens elements in four groups
Works ONLY with Pentax K-mount type cameras
UPC: 027075050877
Effective Magnification 18x with 65mm scopes
23x with 80mm scopes
29x with 100mm scopes
Effective Aperture f/12.5 with 80mm and 100mm scopes
f/12.0 with 65mm scopes
Angle of View 3.1° with 65mm scopes
2.3° with 80mm scopes
1.8° with 100mm scopes 1
Please Note:

The specified viewing angles reflect 35mm SLR cameras & changes on Pentax DSLRs with APS-C size sensors. True viewing field is identical, but APS-C sensors don't see some of it.

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Minimum Focus Distance 19.0' (5.8 m) with 65mm scopes
21.0' (6.4 m) with 80mm scopes
30.2' (9.2 m) with 100mm scopes
Dimensions 2.3 x 5.9" (59 x 149mm) WxH
Weight 0.55 lb (249 g)
Packaging Info
Package Weight 0.76 lb
Box Dimensions (LxWxH) 7.4 x 3.9 x 3.4"
Pentax PF-CA35 K-Mount SLR Camera Adapter
  • Push-On Front & Rear Caps
  • REVIEW SNAPSHOT®

    by PowerReviews
    PentaxPF-CA35 K-Mount SLR Camera Adapter
     
    4.3

    (based on 4 reviews)

    Ratings Distribution

    • 5 Stars

       

      (2)

    • 4 Stars

       

      (1)

    • 3 Stars

       

      (1)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    Reviewed by 4 customers

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    Displaying reviews 1-4

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    4.0

    Maybe I Was Too Harsh in My Earlier Review

    By Old Guy

    from WY

    Verified Reviewer

    Comments about Pentax PF-CA35 K-Mount SLR Camera Adapter:

    After doing more comparisons, I conclude that my earlier review was somewhat unfair to the product. I have been spoiled by my (both purchased used) Pentax A*300/2.8 and FA*300/4.5, so, by comparison, the adapter fell short of my expectations. However, the adapter, new, cost far less than either of the lenses did used.

    Today, I compared the adapter-scope combination with a Pentax K500/4.5 with 1.4x Rear Converter A (700mm equivalent), and the adapter results were at least as good as the lens-converter combination.

    Sooo, I conclude that the adapter was a worthwhile purchase and not bad at all, all things considered. But, it's not likely to give you Pentax *lens quality.

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    3.0

    Maybe It's Just Me, But ...

    By Old Guy

    from WY

    Comments about Pentax PF-CA35 K-Mount SLR Camera Adapter:

    This is a well-built item, but I wish I hadn't purchased it, especially given my experience with the Bushnell Spacemaster II and its camera adapter with the 15-power eyepiece, which simply never produced a sharp image for me. I figured that the PF-CA35, being a lens dedicated for photogaphy through the scope, might be better.

    It seems well-built, but, for the life of me I cannot get sharp images from it, except at the near-focus limit, and even those are blown away by the same image from real telephoto lenses. All the tripod bracing, mirror-lock-up, remote release, careful focusing, even using a properly adjusted Pentax 2x viewfinder magnifier (Ref Convertor A) and extremely high (>1/1000) shutter speeds make no difference. The pictures are soft, soft, soft, and this gets worse with increasing distance.

    The scope combination is hard to focus, even given the very smooth and precise focusing mechanism of the PF-80ED scope (which is a marvel), much harder than with a 300/2.8 and doubler (this should have been a clue from the beginning, but I'm stubborn to the point of stupidity). And yes, I've adjusted the viewfinder diopter. At 400 yards, the lettering on a dumpster is just plain fuzzy, yet, the same subject practicaly jumps off the screen with the 600 (doubler on the 300/2.8). The difference is clear even in the viewfinder.

    In short, the scope/adapter combination is good enough to tell one bird from another in good light, but is not even close to the sharpness I want for prints, a sharpness I get with an actual telephoto lens.

    Live and learn.

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    (3 of 3 customers found this review helpful)

     
    5.0

    Works Great with Canon EOS with K to EOS

    By Martin

    from Atlanta,GA

    About Me Avid Adventurer

    Verified Buyer

    Pros

    • Strong Magnification

    Cons

      Best Uses

      • Bright Conditions

      Comments about Pentax PF-CA35 K-Mount SLR Camera Adapter:

      I use this with a PhotoDiox K to EOS adapter with my Canon 7D body. Equivalent focal length 1500mm at F12. Good fit and good sharp flat field images.

      • Was this a gift?:
      • No

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      (5 of 5 customers found this review helpful)

       
      5.0

      Sharp optics!

      By Gordon

      from South Africa

      About Me Avid Adventurer

      Verified Buyer

      Pros

      • Bright Eyepiece
      • Strong Magnification

      Cons

        Best Uses

        • Astronomy
        • Bird Photography
        • Bright Conditions

        Comments about Pentax PF-CA35 K-Mount SLR Camera Adapter:

        At 1530mm focal length this is a must have accessory for any serious birder. I have just used this product to get photographic proof of an out-of-range bird in the Cape, South Africa. Without it I would never have been able to get close enough to the bird!
        Not only did I manage to get the image but the quality of the picture was so good you can count the hooks on the feathers!

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