I think this is a good example of my earlier topic. A photographer would more than likely consider the question of accuracy of an in camera step tablet test if they knew of off-axis light fall off.
Originally Posted by Michael R 1974
As for Henry's book, I'm glad there's someone who feels the same way.
With grey vs white card question, I guess there could be a small question of the linearity of the exposure. The materials the cards are made of and how they interact with difference wavelengths, like infrared, and the exposure meter's photo cell can also make a difference; but I don't think there's anything fundamentally different with either as a choice of a testing target.
Otherwise we've already discussed how as a choice of testing targets they shouldn't make a difference. They both represent the only exposure value in the test so there's nothing for them to influence.
Last edited by Stephen Benskin; 01-24-2013 at 09:52 PM. Click to view previous post history.