Response to Exposure with Oldies

I would think that the difference between 100 and 125 asa is going to be negligable, in fact I am sure of it. Your best bet is to keep records of your exposures so that when you process the film and make a contact sheet you will know what exposures were the most accurate. I am quite certain that the shutter is not going to be very accurate as far as actual speeds are concerned, but if it "sounds" the same at a given speed each time that it is released, then it will be consistent. After a while you begin to recognize the sound that shutter speeds make, especially at 1/30 and below. You might even compare it to a camera you are used to and see if the sound of the shutters at relative speed ie 1/10 to 1/15 are comparable. Keeping records and comparing them to your end proof will tell you a great deal.

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