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Millimeter (1/1000th of a meter).

In Photography, the term millimeter is used mainly in two contexts: 1) to describe the focal length of a particular lens. In basic terms, the number value in millimeters is the distance of the lens to the film (or image sensor), when focused on a subject at infinity.The focal length of a lens affects the degree of magnification of the object being photographed. 2) Film size is often expressed in either millimeters or centimeters. Normal 35mm format films measure 24 by 36mm, while medium format films would create 6x6cm or 6x9mm negatives, depending on camera manufacturer and model type.

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Q: In photography what does mm mean?
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