【WHAT THE ND FILTER DOES】: The ND filter can reduce the amount of light entering the lens and achieve the effect of reducing exposure, which allows you to use a longer shutter speed or wider aperture to shoot car tail lights, water surfaces, waterfall, and makes the image achieve the effect of silky smooth such as flowing water. 【WHAT THE MCUV FILTER DOES】: It plays a role in protecting photosensitive element and acting as a CMOS protective mirror. So please don't worry when you use the MCUV filter. Because the Kase clip-in filter has no influence on the using and working of the camera, lens, photosensitive element, adapter. 【HIGH QUALITY OPTICAL GLASS AND COATINGS】: The surface of the Kase camera clip in filter kit that is made of high-quality high-definition imaging B270 optical glass has a warter-proof and oil-proof coating, which easily cleans the stains on lenses, and withstand hard shooting conditions. 【NO WORRIES AFTER SALE】: In order to provide you with quality products, all of the Kase clip-in camera filters are produced under a precise and strict system. If you have any problem with the product, you are welcome to contact us at any time, our professional team will try their best to solve it within 24 hours. 【COMPATIBLE WITH SONY ALPHA MIRRORLESS CAMERAS】: The Kase clip in filter compatible with sony alpha mirrorless cameras including: a9, a9mii, a7c, a7mi, a7mii, a7miii, a7miv, a7r, a7rii, a7riii, a7riv, a7s, a7sii, a7siii, fx3, a1 REDUCE THE BURDEN OF SHOOTING EQUIPMENT--The Kase clip-in filter will not be limited by the caliber of various style lenses, which can meet the use of all lenses (wide-angle/fish eyes/macro/medium telephoto lens). There is no need to be equipped with a filter for each lens alone, saving costs while reducing the burden on shooting equipment.