Ok, I downloaded a manual for the Pentax 67, but it does not show the silver doo-hickey on the left. The hoojie on the right controls the frame counter for 120 or 220 load, but I have no idea what the other one does. There does appear to be a pin that keeps it in the current position, which must be pressed to move it.

However I am not a fan of pressing an unknown button on a camera I do not want to break. Can any buddy help me on this?


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