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A photographic lens is used to focus the light onto film or a digital sensor. Many cameras have interchangeable lens systems, allowing the photographer to choose the type of lens to use.

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How do old lenses get dented just on the filter ring?

A lot of it has to do with being careless in the first place or inexperienced people or kids getting ahold of a camera and banging it against something or dropping it.
George McNatt's user avatar