Archived posting to the Leica Users Group, 2001/01/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I came across a small handbook from Fuji that had a formula for calculating overall resolution and here it is if somebody is interested. 1/R = 1/r + 1/r + 1/r etc "R" is the resolution of the total system and the "r"s are the resolution of individual factors. In the formula the "r"s are indexed 1 and 2 and 3 etc., but I did not think I would manage to write this into the e-mail, so I did not try. Instead, look at a practical example. If the lens has a resolution of 200 (Lpm) and the film a resolution of 50, then the overall resolution is 40 calculated with the above formula as follows. 1/R = 1/200 + 1/50 1/R = 1/200 + 4/200 1/R = 5/200 1/R = 1/40 and R is thus 40 (Lpm) To me this means that you will get the best payout in form of improved technical picture quality if you get working on the weakest point in the chain. This probably seldom is your lens, if you have a Leica, even if it is non-asph. I wonder how many lines a shaky hand can resolve, and how many a steady hand. Sorry if you knew this already. Now go back to shooting film. Chris - -- Christer Almqvist D-20255 Hamburg, Germany and/or F-50590 Regnéville-sur-Mer, France