Aloha all. I have recently aquired a neat little B&L Zeiss Tessar 3 1/2 x5 1/ 2 2c in barrel with no iris nor waterhouse stops. With a bit of tinkering, I discovered that the cells screw directly in to a Aphax shutter I had sitting about, and the cell spacing seems the same, and the ground glass of the Graphic displays a lovely image that I can't wait to try. However, the f-stop range of the shutter starts at 4.7 and of course goes up. With a bit of Apugging and a recent thread I've kinda determined that the starting F-stop is 6.3, I just now need to figure out the rest of them. I'm thinking of mounting the lens, putting it against a evenly lit wall, then adjusting the meter at wide open to display 6.3 (5.6 and 4/10s?) and then stopping the lens down until I hit 8 then 11 and mark the shutter. Is this a good method? Anybody have any ideas if I'm on the right track? Much thanks, and ALoha!