temcnicol

These extension tubes are for Minolta, SR mount with MC aperture-coupling tabs. Your second photo is of the receiving mount, as on the front of a Minolta manual focus camera. Your first photo does show that 'notch', out of focus, on the male mount flange.

It's mechanical: in simple terms the second shutter curtain is releasing without being delayed by the camera's clockwork and levers. Does the mirror flip up when you press the release? Fixing it could be as simple as getting a "clean, lube, adjust" for the mirror kick gearset by a person who remembers how to do 101's. But, as said, the repair cost would be more expensive than the camera.

Saw how your Royal camera collection has continued to grow, great work! OK sooo, my 35P f1.9 should belong in your collection. Works fine but the helical is stiff, no chrome corrosion, a few bright marks on back from the case, a few scratches in baseplate. It comes with ok case and plastic lens cover. The little round front medallion is half worn through. And it'll come with a Torca instruction fold-out pamphlet. All will go for what I paid for it. I am still keeping a few 50's rangefinders, including the 3 older Royals. I just registered here (again, after the revamp), so my contact info may no be available until account gets beyond probation. Merry Christmas!