Exposure Calculator Resolution Numbers

[theskyhound]

Actually, it worked out quite well. I made some corrections to the code, and now feel very confident that it is working correctly, although I doubt anyone will ever be able to tell the difference.

But more importantly, I decided to drop the arbitrary factor of 3, which makes the values much more reasonable. It has no effect on the actual calculations because the resolution numbers are only used in a relative sense. Thanks for asking about this!