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| p.1 #13 · Why no slower than 30" shooting |
The Olympus OM-2N from the 1970s went to 2 minutes. (I might add, in about half the size and weight of a Canon 5D.) AFAIK that is the longest of any production camera ever made, and it was done, in Av only, by measuring light reflected off the film during exposure.
My Nikon FE2 will happily expose for 15-20 minutes (or more) in Av mode, and it does it quite accurately, too (assuming you correct for reciprocity).
REally, that must be where the FM3A inherited that feature from. I don't have a FE2 but I have a FE, FM and FM3A. They all have only 1 second on the dial as the max setting. Anything longer in M mode requires bulb with a locking cable thingie. Oddly, A (Av) mode goes much longer. The specs say 8 seconds for the FM3A in A mode but it seems to be closer to 2 minutes (at least that's all it gave under the conditions I tried).