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by w.hrybok

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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 do zoom, magnification, and focal length relate?

Zoom lenses and cameras with superzooms are often sold with an × zoom number — like a 12x zoom or 30x zoom. The question How do I convert lens focal length (mm) to x-times optical zoom? explains how ...
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Why can lenses only focus from so close?

I have always wondered, why is it that a lens can only focus from so far away from the subject? I know some lenses have a kind of macro switch which basically allows them to focus closer but why are ...
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Invariants in subject size and depth of field?

I was curious if I could cheat my way around having to focus stack an object by using different lenses. Playing with the Depth of Field calculator I noticed something interesting: No matter what ...