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WordNet
lens cover

n. cap used to keep lens free of dust when not in use [syn: lens cap]

Wikipedia
Lens cover

A lens cover or lens cap provides protection from scratches and minor collisions for camera and camcorder lenses. Lens covers come standard with most cameras and lenses. Some mobile camera phones include lens covers, such as the Sony Ericsson W800, the Sony Ericsson K750 and the Sony Ericsson K550.

A more secure lens cap is the metal screw-in lens cap which cannot pop off a lens accidentally. Although a screw-in cap takes more time to remove in order to take a photograph than a standard lens cap, it is stronger than plastic and therefore more protective.

Usage examples of "lens cover".

He staggered as he caught hold of the larger telescope and struggled to take the lens cover off.

One of the wall sec men near the old Las Vegas Convention Center raised a flash with a purple lens cover, signaling twice.

He unlimbered his equipment and began snappihg frantically, until Ross pointed out that his lens cover was still on.