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X-Cap is an Auto-Closing Lens Cap for Mirrorless Cameras

Compact cameras feature lenses that automatically "cap" themselves when retracted and not in use. Interchangeable lenses, on the other hand, usually don't. The X-Cap changes that. It's a Taiwan-designed lens cap that snaps onto the front of certain lenses that feature a retracting front element (the Micro Four Thirds system has lenses like this). When the front element retracts, the cap automatically closes -- great for people who hate dealing with lens caps.