the recent thread "Distance measurement" from Tashley, in which he recommended a DOF calculator lead me to think about DOF and COC.
i tried this app and another from the same author now am wondering which settings would give me optimum and usable results.
one of these apps let you set the near limit and the far limit and the focus point will be calculated as well as the needed aperture and the resulting COC. the algorythm also regards diffraction.
but which COC is acceptable to look sharp at a desired print size?
my sensor (6,7micron 39MPx) should bring good sharpness with a COC of 0,041mm when printed and viewed at a distance equal to the diagonal of the print size
i'm able to print @300ppi for 600x400mm without resizing.
but as a pixel peeper i want to view those prints at a closer viewing distance. let's say 250mm instead of 740 (normal viewing distance) - which would be 3 times closer - how big is the maximal COC (which affects my DOF) in this case?
0,014mm? (which would be 3 times more precise)
is there a rule of thumb to know: at a COC of "x" i'll get a decent print at size "y"?