noseoil said:
... The papers usually come with an index of settings for VC paper (I know ilford does). ...
Tim is correct. In the instructions for Ilford papers (should come with every package), there is a chart with numbers for yellow and magenta and the equivilent multigrade filters. For the Omega, most of us use the "Kodak" numbers. (IIRC, Omega says to do this.)
There are two charts. One has simple settings of EITHER yellow or magenta, but the exposure time will change for each setting. The second chart has a combination of Y and M for each grade, that gives (more or less) equal exposure times.
NOTE: these are the numbers in the Ilford documentation. I have no idea why the amount for grades 00, 4.5 and 5 are different on each chart! :confused: They just are. Testing is advised, as always.
Anyway, I made myself a much easier Excel chart to read. I had to put it in Word to attach it here, but it should work.
Cheers, y'all.
David