Originally posted by digital029art I'll try to post some images, but it's not really necessary - talking about vignetting, strong vignetting (even on all sides) and it only occurs at speeds over 1/320 and up.
Obviously this is related to the leaf shutter in the K->Q adapter, but how? Could the shutter be defectives somehow?
Well, it shouldn't do that -- the last thing a K-mount lens should do on a Q is vignette (especially if it is a full frame lens).
Are you using a flash? That won't work at those shutter speeds and you will get weird effects (and it shouldn't even fire at all unless you are using a separate trigger somehow). But that wouldn't cause even vignetting, so I'm assuming no flash, right? But in daylight no flash, should work fine, and if only at certain shutter speeds I guess it could be the shutter but I'm not sure that would make a vignetting pattern, sounds strange.
So, what lenses exactly are you using? Is this happening with more than one? If only one, does it work right on a non-Q K-mount camera? How are you stopping down (with the adapter ring or with an aperture ring on the lens)? Etc etc...