Focus stacking (or hyperfocus) (called also z-stacking, focal plane merging...) is a digital image processing technique which combines multiple images taken at different focus distances to give a resulting image with a greater depth of field than any of the individual source images. Focus stacking can be used in any situation where individual images have a very shallow depth of field; macro photography and optical microscopy are two typical examples.In the embed at top, the left image is focused on the front of the fly, the middle image focuses on the back, and the combined image at right shows the entire insect in focus. I don't have the software or skills to do this, and my subjects rarely hold still, which is why my butterfly photos lack sharpness throughout the depth of field.
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