PDA

View Full Version : Dd in mm for f-stops smaller than F64



G Benaim
6-Oct-2007, 09:48
Hi all,

I've been using the focus distance differential method for establishing f-stopm, but the chart given in the article here on LFF only goes to f64. Using 8x10 I'm frequently in need of smaller stops, so was wondering if anyone has the numbers for 90 and 128. Thanks in advance,

GB