It's designed to fit Canon 450D/500D only and protect them from scratches scrapes and fingerprints. Plus it's also removable: it is designed to not leave residue on the screen. - Use a 0.5 ultrathin optical glass with at least 90% transmittance and the image is displayed when applied - With special treatment its hardness and durability is close to or as high as mohs scale 8H preventing the LCD screen from being rubbered and scraped - Except the round framing eyepiece have added anti-fog eyepiece so that it combine the function with anti-fog and anti-dust - With the connection of push-pull type or bayonet fixing it is easy to install and remove