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When I use the zone system approach to metering a scene, I usually meter through the filter I am using. As I optimistically assume that this takes care of the filter in the exposure calculations, I then enter a factor of 1 in the expo-dev program.
Of course we can't do this with the incident system; we must enter a filter factor and hope for the best. Yet my experience of metering through filters suggests that the effect of a colored filter will vary significantly with the light conditions and (obviously) color of objects in the scene. Also, it has been suggested by various reasonably authoritative sources that different B&W films respond somewhat differently to filtration. (This would be a problem for both zone and incident metering.)
I use the incident system for perhaps 1/3 of my shots, and in those instances I simply enter into expo-dev the filter factor inscribed on the filter. Since I have never seen evidence of a problem from doing this, I am guessing that the filter factor error is generally in the direction of over-exsposure, which would cause us the least difficulty in printing the resulting negative.
So, my question to Phil or other users of the incident system is: is it best to continue to enter the listed filter factor into the exposure calculation, or is there a better way to proceed?
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