Allow entering reciprocity adjustments directly for film/developer combinations
When exporting film data from Plotter users may select to include reciprocity adjustments by selecting a letter/number combination specific for a film/developer combination (e.g., A7 for HP5+ in Xtol 1+1). These adjustments are based on testing conducted by Davis. In my experience, these are often not ideal at best. The first character in the 2 character value is the exposure class which adjusts for exposure reciprocity. There are five fixed classes each corresponding to one specific value (1.17, 1.23, 1.29, 1.35, 1.42). The second character is called "G" class which is an adjustment for contrast change with increased exposure time. Here there are 7 fixed "G" classes (-0.465, -0.325, -0.2, -0.1, 0, .07, 0.15). It would be a large improvement to allow the user to enter values for both exposure and "G" class directly from a reasonable range of values. These would correspond to specific testing done by the user, or simply to the charts provided by the manufacturers for their emulsions. This is an advanced feature and could be included with one of the settings pages and would be activated only if the user requires it. After all, the whole point of BTZS is that exposure and development decisions are based on sound data obtained under the specific conditions of the user.
Given some more thought and some experiments with the calculations, I just don’t see the benefit for the increased complexity.