The 40XS has clearance for the mirror. Rice high posted samples from a 5dmk3 
and it didn't fully cover the frame. The corners were very soft. Of course on 
film  it might be better due to film handling oblique angles of light beter.

Steffen Zahn <[email protected]> wrote:

>Interesting. I thought that the XS lenses were not compatible with SLRs
>because there would be a collision with the mirror movement.
>
>Steffen Zahn
>
>
>Am 02.04.2013 um 01:51 schrieb Mark C <[email protected]>:
>
>> I recently stumbled on a Pz-1p at a good price and bought it - I
>doubt that I'll use it much but it is a great camera and I do still
>shoot film. Took it out to test and tried the DA 40mm XR that came with
>the K-01 on it, just to see how it looked. I tried this earlier on an
>MZ-S but since I could not directly control the aperture I did not test
>it systematically.
>> 
>> The DA 40mm XS works very well on the full frame 35mm film body!
>There is noticeable light falloff at f2.8, noticeable enough to be
>objectionable, but it is greatly diminished at f4 and more or less gone
>at f5.6 and beyond. For an f8 and there lens it would be fine. Pretty
>remarkable considering the small size (and thinness.)
>> 
>> Mark
>> 
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