1.(One-touch Installation and Removal) Universal Spare Lens Cap: Simply push the on/off button on the inside and remove with one touch. The inner type has no protrusions or knobs in the outer circumference, so it won't come off even when the camera is lowered from the shoulder. Please check the lens filter diameter for the cap corresponding aperture size 2.(Simple Design Fits Any Manufacturer) Simple design without the manufacturer's . Compatible with various manufacturers: Nikon Nikon, Canon Canon, Sony Sony, Panasonic Panasonic, Olympus, Ricoh , FujiFilm , Pentax, Sigma, Tamron, Leica , Konica Minolta etc 3.[Size Variations] 1.5, 1.7, 1.7, 1.8, 1.9, 1.9, 2.0, 2.2, 2.3, 2.3, 2.3, 2.3, 2.3, 3.2, 3.2 inches (37, 40.5, 43, 46, 49, 52, 52, 672, 72, 72, 72, 72, 72, 72, 72 4.[Precautions for Use] May not be compatible with some lenses such as micro, fisheye type, and large aperture zoom lenses. Please install a filter or the like