I'm still digging through the camera collection I inherited. Just coming to the bottom of the pile. Yesterday, I found a Zeiss Super Ikonta IV. It's got a selenium cell light meter. It looks like the meter has gotten weak with age. Comparing it to my Gossen meter (CdS cell) which I trust, the meter in the camera seems to read about 6 EV too low. I would like to run a roll or two of film through this camera to decide whether I want to keep it as a shooter. Question: Should I assume the meter in the camera is shot? Option #1: When using selenium "stack" rectifiers in old movie theaters it is sometimes possible to rejuvenate them if they aren't too far gone. I don't suppose that's possible in this case. Is it? Option #2: Is it possible to assume that the 6-EV offset is constant and just add 6 to whatever the meter says? Option #3: Probably the most likely solution would be to just keep the Gossen in-hand and use that instead of the camera's meter. It's an uncoupled meter anyway. It's not that much of an inconvenience to use the hand held one, I guess. At this point, I'm thinking Option #3 is the answer but, just for knowledge, what do you think about options #1 and #2? T.I.A!