Whoops! Sorry to muddy the waters, but ghostcount doesn't yet have a good grasp about MG filters.
The best way to learn about them is to pick a negative, one you've printed before maybe, and print at each grade. Skip the 1/2 grades, if you want. The higher grades (4, 5) will need more time than the lower ones. The you'll have a good grasp of what the different contrasts are, and how they can be used for your printing.
Split grade is much more complicated than depicted. If I can print an image at 2, why would I bother to print 10 seconds with 00, and 10 with 5. I have negs that might call for 3 seconds on 00 and 22 on 5, or I might need a lengthy low contrast exposure, and just a few seconds of high contrast. Check out Les McLean, for the low down on split grade.
I 'd suggest not going there until you are more familiar with the darkroom and straight forward MG printing.
Last edited by sly; 12-10-2012 at 10:55 AM. Click to view previous post history.
Reason: Clarity, spelling