Oh and there's a "general rule" to cut off one stop per 10 years, so if a film expired in 1993 with an ASA of 400 I would shoot that at 100 because as it ages it loses speed. Unless its been frozen then it's a different story so knowing the history is important. The oldest I've gone is 1947 film that I act silly over exposed because it seems the "slow down factor" levels off after a few decades... So if its 35 years I suggest cutting it to 25 years of compensation (and make sure to account for the change in the design of film speed ratings, they DOUBLED the speed factor at some point in the past.

I went and dug up the last roll of Panatomic-X I shot from the 60s,



As you can see I labeled it as shooting at EI 12....

And here is a strip on my light box to show density...



That should be helpful...


~Stone

Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1, 5DmkII / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic | Sent w/ iPhone using Tapatalk