Doremus Scudder
Member
That is what always made me chuckle when people ask what development time one should give a film. It is not a cast-in-stone number...varies with the SBR and what process one is using to make prints.
Amen!
If I were a large-volume portrait photographer, I'd calibrate my entire system from lighting ratios through final print so that I knew that I'd get the result I want every time I pressed the shutter, assuming, of course, that I want the same result every time. The same goes for copy and product work. After getting the kinks worked out, one doesn't even have to have a meter; just set the strobes or lights at the predetermined value and go. Repeatability is great in these situations, but needs to be calibrated from beginning to end.
For those of us that work with natural subjects in various differing lighting conditions, knowing what to change in order to get the result one desires (or get close enough anyway) is key. If you can't control the lighting and SBR, then you have to adjust processing to compensate.
Best,
Doremus