You mean the camera is overriding my choice to use the 85 filter.
I thought at one point I moved the filter switch while in the automatic expoosure mode and I thought the exposure shifted 2/3's of a stop. Well, it should be easy enough to test that option tomorrow.
I don't have a b&w cart here to check, but what could be happening, if you see an aperture change, is that you are "telling" the camera you are shooting under daylight or tungsten, since b&w film has slightly different ISO ratings based on the type of light. With colour film the different ratings for tungsten or daylight are including the filter factor (the film only has one rating) but b&w has two ratings and I sometimes wonder how the camera knows what you are shooting with. The difference is so sight that I have never worried about it, but I am curious what you learn.
And try over-exposing the tri-X. It's counter intuitive to overexpose reversal film, but try it, you might like it.
Edited by Rick Palidwor, 23 April 2007 - 10:23 PM.