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Macro photography is a specialized area typically dealing with very small subjects. There are also "Macro Lenses" which are designed with macro photography in mind, and lower cost alternatives such as close up filters and extension tubes.

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How to estimate the minimum magnification to capture features of a certain size?

What is the correct way to estimate the minimum magnification (maximum subject distance) at which features of a certain size are resolved? My thinking is that given a system capable of resolving a ...