Man, that's wild, According to the zone 1 test I just did, I'm getting a film speed of 25, maybe a hair faster--40 tops. That is with D-76 1:3 6 minutes at 70-72 degrees. I wonder why there's such a big difference? You say 200, some on the LF Form say 160, a lot more say 80, and I'm getting 25. Very strange. But I've already tried shooting an actual photo at 80 and it was underexposed bad. I'm asking around to friends for a computer mouse I can cut up and make a shutter tester out of, but my shutter SEEMS pretty close already. That's the only variable I can think of. My meter is dead on the money. It's a Luna-Pro that I put a 1.35 volt voltage regulator in, and it is in line with my 2 SBC's and my Sekonic.
Originally Posted by Mainecoonmaniac