Pentax DA 12-24 on film
The Pentax DA series of lenses are designed with an image circle that covers the APSC sized digital sensor. They are not intended to be used on a 35mm film camera, as they create large amounts of vignetting. That almost sounds like a challenge to me. I mounted my DA 12-24 on a PZ1p loaded with Kodak Ektar and experimented. It is immediately apparent that the wide end between 12 and 18 millimeters is out as the lens just doesn’t come close to covering the film frame. You can see this immediately in the viewfinder. However between 18 and 24mm and with the lens adequately stopped down to about f11 you can actually use this lens as an ultra wide zoom on film. Converting the image size factor around from 35mm to APSC means the 18mm on 35mm film is about equivalent to 12mm on APSC.
Here you can see what happens if you don’t stop down enough, although I think this shot was taken with the DA 35mm ltd with the lens hood deployed.
