Hi all, I have been experimenting with developing a best practices solution for setting the global exposure level of an entire roll of film based on spot metering the unexposed film leader (or what’s left of it). Has anyone had success using this method?
I’ve read several articles about setting the exposure for DSLR scanning, but surprisingly none of them seem to provide an accurate formula. Rather they give specific camera settings and fail to factor in that everyone’s light source will ultimately put out variable brightnesses that will affect the shutter speed for each individual setup.
I have also read on many forms that aperture priority mode should not be used, and that a single setting should be used for an entire film role. So it seems that people are ultimately measuring their entire role’s exposure level using the histogram of the first frame. What if that frame is under exposed? How can we know that that is the best reference to use for the exposure of all frames in the role? It seems to me like coming up with a formula based on the light coming through the unexposed leader of the film could be the most reliable method in establishing a baseline for the proper “mean exposure level” of the roll. Thoughts?