![]() Note: given the sensor size, the circle of confusion is calculated assuming a print size of 8''×10'' (20cm×25cm), a viewing distance of 10" (25cm) and the manufacturers standard visual acuity. ![]() These cameras automatically correct for the effective f-stop and show it on the LCD display. Regarding the aperture, on the calculator, set "YES" to "Aperture is already an effective f-stop" if you're using a Nikon camera. It is calculated as Total depth of field × 0.8. Safe step size for stacking (20% image overlapping): It's the maximum step you need to move the camera on a focus slider in order to capture the whole subject in focus when applying the focus staking technic.Smallest Subject which can fill the image: the size of the smallest subject that can fit in the image.Total depth of field: The distance between the farthest and nearest points which are in acceptable focus.Then, effective aperture is: (1+ Magnification/Pupil Magnification). For longer focal lengths (macro lenses), you need to take into account lens Pupil Magnification. ![]() This works pretty well for focal lengths around 50mm.
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