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The Center Pinch Snap-On Lens Cap from Samsfoto is a front lens cap with a squeeze, spring, and snap-on mechanism. It is easy to put on and take off, especially when using a lens hood, and it stays on. Lens caps protect your lens from scratches, fingerprints, and the elements when the lens is not in use. It&39;s always good to have a spare in your camera bag, too.