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     JIM Rating: N/A |
David- I picked up a Canon F-1n a week ago. It has the same lever arrangement. According to a Canon manual by Carl Shipman,the lever under the stop down has two functions. When the self timer lever is pushed toward the lens and the other lever moved to L the lens is stopped down and locked in that position. When the lever is moved to the M position,the lens is stopped down,locked and the mirror is locked up. I'm assuming your FTb operates the same way. (maybe?). The F-1n is my first Canon SLR. (Assuming a pellix doesn't truly count). Hope this helps--if not someone will straighten us both out. JIM |