The X-cap lens accessory can be mounted on interchangeable lens cameras that use retractable zoom lenses, such as Panasonic's 14-42mm pancake zoom, that require lens caps. Unlike conventional lens caps, the X-cap has a tiny mechanism below that activates the X-cap's lens opening when it's extended, and closes when it's retracted.
We think this is a very handy accessory as it means not having to remove (or lose) your lens cap ever again during a photo shoot. No details have been released yet on price or availability, but you can see the X-cap in action below.
(Source: Crave Asia via PetaPixel)