Explains the relationship between the rubbish sensor size that makers 
usually use (and why they feel they can get away with using it) and 
actual size.

As a rough rule of thumb actual sensor width is typically very 
slightly more than half the size that the name implies. eg a 2/3 inch 
sensor has an active sensor width of 8.8mm (whereas 2/3" = 16.93 mm).


        http://www.dpreview.com/news/article_print.asp?date=0210&article=02100402sensorsizes

An "APSC" sensor, as used in many low to medium level DSLRs (including 
the one I am contemplating acquiring)  has about 7 times the area of a 
2/3" sensor (such as is used in my beloved 7Hi.) This implies, all 
things being equal (which they never are), almost 3 more stops of 
sensitivity.




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