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Phil,
OK, OK, I'm not asking to revamp the entire BTZS approach or anything, but I have two questions regarding zone placement and the way the BTZS approach is applied.
Is there a way, given the Expodev software, to calculate the actual expected film density for a given reading? That is, without pulling out the film curve charts and placing the zones and then sliding up to the curve and then over to the density, as that will be cumbersome to do in the field. I am thinking about bieng able to ensure that the film density at certain points is at least a minimum point to ensure adequate density.
For example, most people automatically set their shadow to zIII. This tends to produce dense negatives for me, and I want to place mine lower, since I print with platinum. But I don't want to go too low, or I will start to lose detail. Hence, I would like to be able to predict what the negative density will be for a given reading.
Since the film curve is nonlinear, I cannot make a conversion factor for the zone placement spot check, although it may be reasonably close in the middle of the range. Down at the toe, it will not be accurate.
The second question is, what can I do to properly set the DR of the film if I were to choose to not use the traditional zII through zVIII as the ES range? Suppose I wished to use zIII through zVIII instead, what options do I have to accommodate this?
Thanks,
---Michael
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