While searching the web for things photographic I came across a great site with some lovely charts and text relating to F/stop, Shutter Speed, ISO, and EV along with a large range of table for those who don't like to do the math.
http://www.scantips.com/lights/fstop.html
Looking at the basic site http://www.scantips.com there seems to be lots of good information about scanning and discussion on image size and ppi. I will have to have a look at all that stuff some other time.
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