I know the condenser on a D2 should be matched to the lens focal length (I'm not talking about the variable consdenser models). But what's the impact if not matched? Does it vignette or illuminate unevenly? Specifically, what happens with a condenser designed for 90-105mm lenses when used with a 150mm lens? And what happens with a condenser designed for 150-165mm lenses when used with a 90mm lens? I'm thinking in terms of print sizes up to 11x14. Thanks.