which lens, what apertures, and are you sure the wall is evenly illuminated?
Pentax DA 18-55, f/3.5 Vivitar 28-105, f/3.5 through f/8 Vivitar S1 (Komine) 70-210mm, at 70 through 210, f/2.8 through f/11 2x doubler
I didn't do much of a fancy test, but wall, paper, etc were different test setups. No real careful illumination, but close enough so it should have been pretty consistent.
-Cory
************************************************************************* * Cory Papenfuss * * Electrical Engineering candidate Ph.D. graduate student * * Virginia Polytechnic Institute and State University * *************************************************************************
