XPro1 Depth of Field Question
From a practical standpoint, i agree with most of your comments except for the ones that refer to the fact that the Fuji has no antialiasing filter. C of C and DOF are the result of mathematical equations that do not take the media (film or sensor) quality into consideration. It would seem that from the equation standpoint alone, the only variables that apply are format size (film or sensor), focal length and lens opening (F stop). See the formulae below as copied from:
http://www.dofmaster.com/equations.html
It is always true that stopping down improves the depth of field until you hit the circle of confusion (C of C) at which point the sharpness starts to decrease.
Now the formula doesn't take into account real world situations such as the quality of the media, the quality of the glass, etc. The formula is only a starting point from which individual camera/lens combinations are better or worse than the formula predicts.
Therefore, using that standard formula, the XPro1 should be no different than any other APSC camera. So why does Fuji use .005, a number that is four times more critical than standard? It's good to be conservative in order to assure better results, but I was simply wondering if Fuji is simply being arbitrary and super conservative, or is there something else going on with the camera that caused them to use such a critically small C of C.
Hyperfocal distance:
Near distance of acceptable sharpness:
Far distance of acceptable sharpness:
where:
H
is the hyperfocal distance, mm
f
is the lens focal length, mm
s
is the focus distance
Dn
is the near distance for acceptable sharpness
Df
is the far distance for acceptable sharpness
N
is the fnumber
c
is the circle of confusion, mm
fnumber is calculated by the definition N = 2i/2 , where i = 1, 2, 3,... for f/1.4, f/2, f/2.8,...
Jim
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