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But the only way to know for sure is to do the tests. That requires a densitometer. Two lenses made by the same manufacturer in film days Nikon, Canon even medium and large format lenses had usually a half stop tolerance. There could be a 1 stop difference between two different lenses by the same manufacturer made back to back. Then there is tolerance and that variance in meters. See so without testing you could potentially have huge difference in ASA/ISO rating. Then there's the developer/film/agitation/temp issues.
Three great books on this are by Adams
Also Fred Picker's...Show more →
Thanks, I am aware of the first three books, but my preference is the book from Lambrecht "Way Beyond Monochrome" which I find much more of practical use. It is like pixel peeping in digital - we can go to an extreme in everything, for me it simply works well with less sophisticated methods .