Berkeley CSUA MOTD:Entry 50040
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2025/07/16 [General] UID:1000 Activity:popular
7/16    

2008/5/23-27 [Consumer/Camera] UID:50040 Activity:nil
5/23    Are there Pentax K-mount to Nikon F-mount converters out there?
        I have a bunch of pretty good older Pentax K-mount lenses that
        I'd like to use, and I don't mind manual F-stop and manual focus.
        I also realize that I'll lose 1-2 F-stops by using a converter.
        I'm just wondering if such a converter exists. ok thx.
        \_ "Losing 1-2 F-stops by using a converter" is something
        \_ 1. "Losing 1-2 F-stops by using a converter" is something
              associated with teleconverters which increase the focal length,
              not converters in general.
           2. It looks like you'll need two converters:
              K to M42: http://tinyurl.com/5ze892 (B&H)
              M42 to F: http://tinyurl.com/5l5h62 (B&H)
              I've never used lens mount adapters.  You'd better call B&H to
              confirm that this method actually works before you buy them.
              Do lens mount adapters have lens elements to compensate for the
              increased length of the combined lens?  I imagine that if they
              have lens elements, you'll lose optical quality.  OTOH if they
              don't have lens elements, you won't be able to focus at infinity.
2025/07/16 [General] UID:1000 Activity:popular
7/16    

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Cache (662 bytes)
tinyurl.com/5ze892 -> www.bhphotovideo.com/c/product/147971-REG/General_Brand_ABPSPK_Universal_Body_to_Pentax_K.html
This adapter allows a Pentax K-mount type lens to be mounted on a "universal screw mount" (Pentax M42) type body . Although the lens will fit physically, automatic diaphragm (AE metering), or any other functions are not retained using this adapter. In this case you will need to meter in "stop-down mode" since the lens does not have the ability to have its aperture controlled by the camera body. User Agreement & Disclaimer Prices, specifications, and images are subject to change without notice. Not responsible for typographical or illustrative errors. Manufacturer rebates, terms, conditions, and expiration dates are subject to manufacturers printed forms.
Cache (264 bytes)
tinyurl.com/5l5h62 -> www.bhphotovideo.com/c/product/97559-REG/General_Brand__Nikon_AI_Body_to.html
User Agreement & Disclaimer Prices, specifications, and images are subject to change without notice. Not responsible for typographical or illustrative errors. Manufacturer rebates, terms, conditions, and expiration dates are subject to manufacturers printed forms.