[pure-silver] AN Glass Effect on Sharpness

Hi All,

I think this question is for all the optics aficionados here:
My enlarger uses AN glass above the neg, and clear glass below. With my b&w Rollei negs this works very well, but with color negs not well at all. Even though the emulsion side is in contact with the clear glass, I still get rings. I'm thinking of getting another piece of AN glass for below the neg. (emulsion side). Will that have any effect on the projection, and the resulting print? 

Thanks,

Elias
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