Let me answer a couple of different things all at one time. First, I don't know why the EXIF data has been stripped (if it has). Basically yes, I shoot everything wide open at f2 and I try to stay as near to base ISO 100 as I can. The lens is pretty easy to dismount from the bellows (it has a retaining ring but that is a bit hard to reach). However the lens has a coupling lever for the rangefinder that I ended up cutting. After that it is possible to use the retaining ring to mount the lens on a ring to screw into a short M42 helicoid. The biggest problem is to keep the shutter open, since there is no T setting. If I were more enterprising, I would have disassembled the lens and removed the shutter blades, but that is a bit scary, so I rigged up a small tab to keep the shutter level from closing. It is a lovely lens, and extremely sharp in the center.
