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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 can I calculate the effect of a supplementary close-up lens (a.k.a macro filter)?

If I have a +1, +2, +4, or +10 close-up lens which attaches to the front of my regular lens, how can I calculate its effect on close focusing distance, figure out how much magnification I can get from ...