Several point-and-shoot cameras usually have built-in Lens covers for their lenses but SLR cameras (which allow lens changeability) generally do not A lens cap covers the front of a lens to help protect it (during Storage or non-use) from dust or minor shocks A rather inexpensive investment that can be vital in preserving the surface of your valuable lens
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Pictured above: HAKUBA USA INC 46mm Lens Cap for Camera Lens
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