If my calculations are correct for a two inch lens I will have a lens to subject distance of 2.9" and a lens to film distance of 6.4" for a magnification of 2X plus with adequate 60 degree cone coverage for the 4x5 film. I want to make some macro photos of plant structure. My wife has some interesting specimens in the garden window. Since the lens to film distance is 3X focal length that means the exposure compensation is 3 Squared or 9X, right? So if I read 1/10 second on the meter it will really be 1 second plus reciprocity effect.