|Focal Depth||Royalty free photographs http://www.focaldepth.co.uk|
Focal Depth depends on, lens aperture, focal length and focal distance.
Focal depth also depends on either the resolution of the image sensor or the resolution of the final image.
The above examples illustrate focal depth in action.
A simple formula for depth of focus is given as follows:
Dfar = cof * Fno * D * D / ( f * f - cof * Fno * D)
Dnear = cof * Fno * D * D / ( f * f + cof * Fno * D)
Df = Dfar + Dnear
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