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David Busch’s Canon® EOS M Guide to Digital Photography by Lee Sheldon

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Focus Stacking

If you are doing macro (close-up) photography of flowers, or other small objects at short distances, the depth-of-field often will be extremely narrow. In some cases, it will be so narrow that it will be impossible to keep the entire subject in focus in one photograph. Although having part of the image out of focus can be a pleasing effect for a portrait of a person, it is likely to be a hindrance when you are trying to make an accurate photographic record of a flower, or small piece of precision equipment. One solution to this problem is focus stacking, a procedure that can be considered like HDR translated for the world of focus—taking multiple shots with different settings, and, using software as explained below, combining the ...

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