Originally Posted by
Pere Casals
Jac, it's not necessary to measure lp/mm on paper, I was telling it in numbers what it can also be told in words. Let me say it in another way:
The way we consider what's in the DOF range depends on the enlargement we plan (as Dan pointed), but also it depends on how sharp we want the print, if a large print has to look flawless when viewed with the nose on it then we will consider DOF is narrower than if the large print has to look flawless from 1m.
So in the first case the CoC is perhaps 1/3 on the one for the second case. Not necessary to make calculations, just we have a feedback from previous jobs. I used the 6 lp/mm value because it is the known required IQ from reading distance, and 2 lp/mm because it's an IQ of a flawless print seen from 1m, aprox.
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