I have one A lens that was defective, in that the little pin did not pop up properly, and a body would not recognize it as an A lens. I managed to fix it by stuffing some aluminum foil inside the little hole (and holding it on with aluminum sticky tape).
Collin Brendemuehl wrote:
I was in error. The camera needs the "A" contact CLOSED to see an A lens. Then it needs the coding to determine maximum aperture available. Since the "A" pin is FLAT/Recessed on the body, M lenses don't contact it.
Make all lenses permanently A by swapping the body flat pin for a dome-topped pin that will always make contact with the lens mount. Then make divots into the lens mount to create the appropriate coding for the body to read.
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