Response to Pre-exposure

I used to preflash color slides by shooting a white card, after stopping down 3.5 stops from what my light meter called the correct exposure. Since I was usually using strobes, and small f stops were called for, I had to put enough neutral-density filter in front of the lens to provide the exposure reduction my diaphragm couldn't manage. I was trying to get a 10% preflash. I never tried this with b&w film, but it seemed to cut contrast a little in color.

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