What factors affect grain?

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Originally Posted by Helen B

'ANSI, itself is no more'

ANSI still exists, and it is responsible for a number of photographic ISOs, including the ones on the required purity of chemicals for photo use. It is reassuring to know that the purity of our vital fluids is controlled by the free world.

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Hah!!! I stand corrected. I just visited that site. It doesn't look a lot like the old ANSI that I knew, but you are right ... it still DOES exist!

I'll have to search further ... I tried entering "Film Speed" and a couple of permutations of that ... with no success.

Interesting. THANKS!

It's covered by the ISO standard. Here's the B&W one.

Best,
Helen

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Originally Posted by bjorke

Digital ICE etc, do not function on B&W films like Tri-X. XP-2, yes. FP4, no.

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Oops, you're quite right. David.

Before you do any testing or rating of the film you might want to get your camera(s) checked and calibrated, especially if you are using the onboard meter. It's meaningless to rate a film if your shutter speeds and meter are not calibrated. This should be the first step.

The film testing puts that inconsistancy into account. A lot of hardcore large format photographers I know do density testing for every lens' that they own.