Quote Originally Posted by Rafal Lukawiecki View Post
I think I understand why it is necessary to have the entire optical system in use, lens, bellows etc, so as to account for the flare, shutter behaviour, aperture etc, while performing the test. I wonder if having the tablet sandwiched to the film, as Nick and Chuck mentioned, would make a significant difference to the results.

You really should consider eliminating as many variables as possible. The idea is to obtain good data and then incorporate all the variables, determined individually, when interpreting the data. If you are testing for the film's characteristics, you need to separate it from the optical system, and that means contacting.