I have done diode modifications to my Olympus OM-1 and Canon FTb so I could use SR-44 batteries in them. The Olympus had a cam inside that I could adjust until the meter matched my "source of truth" spotmeter at all relevant EVs. The FTb had a set of 3 potentiometers under the top plate that served the same purpose. Both are now within 1/3 stop of my spot meter, and have produced several rolls with fantastic results relying on those meters.
I recently purchased my grail SLR, a Canon F-1n, in really fantastic condition. While I'm undecided on a diode modification there, and am currently just using 675 zinc air batteries, I find its meter doesn't agree very closely with my spot meter in most cases. My Google-fu has not turned up much of anything helpful. Anyone know what the procedure is for adjusting the meter on the F-1n (not the New F-1, to be crystal clear).
I recently purchased my grail SLR, a Canon F-1n, in really fantastic condition. While I'm undecided on a diode modification there, and am currently just using 675 zinc air batteries, I find its meter doesn't agree very closely with my spot meter in most cases. My Google-fu has not turned up much of anything helpful. Anyone know what the procedure is for adjusting the meter on the F-1n (not the New F-1, to be crystal clear).
