I suggest the following: (Off the top of my head)
My take on a digital zone system
Use an off-white subject with fine texture. Like a bath sheet, taped up on the wall.
Set up a digital camera on a tripod about a meter away and take a reading off the towel.
Shoot an exposure at that reading it should give you zone 5 right?
Shoot, successively, in 1-stop increments, 5 stops down and 5 stops up. That will give you 11 stops of exposure range. From these you can make up a greyscale in PS which increments at exactly 1-stop.
Don't do any image processing to the raw files. Or, I should say do the same to all of them.
Take a few readings, (INFO) find out how it relates to the 0-255 thang. You can plot it out.
See where detail disappears at each end etc.,
See what happens when you shoot JPG and compare.... etc., etc.,
h
Head of the Department of Photography,
Muscat
Sultanate of Oman
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