Focus Stacks
When shooting macrophotography there are two mathematical laws of optics which are very important. The first states the resolution of the lens is related to the size of the aperture, in that the wider the aperture the more the lens can resolve. There are limits to this in that at wider apertures other optical effects are more pronounced usually leaving the sharpest aperture on a lens around 2 or 3 stops lower then wide open. The second law states the depth of field gets smaller for wider apertures, and increases when the aperture closes down. This effect is exemplified with pinhole cameras which have extremely large depths of field. Focus stacking invovles taking many photographs each one a certain distance apart from one another so that each part of the subject is in focus.
