Sandy Harris <[email protected]> wrote:

>A useful reference:
>http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html
>
>General rule is that a lens designed for a longer register distance
>can be adapted to a camera with a shorter distance easily, basically
>you just just a tube with the right mount connectors. To go the other
>way you need glass in the adapter.
>
>There are some interesting adapter options here.
>http://leitax.com/

Yeah, I got my numbers backwards in my first post. But my followup had
it correct and this adapter *will* work:
http://www.bhphotovideo.com/c/product/995307-REG/fotodiox_fd_pk_g_pentax_k_camera_lens.html

But it does contain a glass element and, as one PDML'er put it a few
years ago "will add nothing but suck to your photos". It's essentially
a 1.1x teleconverter with cheap, crappy elements.

But those lens elements are removable and you can use the
teleconverter that way if you don't mind losing infinity focus and
automatic stop-down. It'll probably be good for just close up work
when used with a 50mm lens, due to the additional space between the
body and lens.

I have one that I use for putting my Sigma 180/3.5 macro (K-mount) on
my Sony A850 body.

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