Compatible Cameras: Canon EOS-1D/1Ds/1D Mark II/1Ds Mark II/1D Mark IIN/1D Mark III/1Ds Mark III KPS UME 1-13c Product Overview Magnifies the viewfinder by 1.3x This magnifying eyepiece enlarges the viewfinder by 1.3x. The screen and information within the viewfinder can be seen enlarged. Because the size appears to be one rank larger, focusing and framing can be done smoothly. With 35mm full-frame digital cameras, the periphery is slightly obscured, but you can confirm it by moving your eye. Uses 2 groups, 3 elements of optical glass The magnifier lens uses 2 groups, 3 elements of optical glass, so the periphery is bright and the image is not distorted. A full-fledged magnifying eyepiece with a lock Includes an eyepiece, eye cup, and portable screwdriver. Tightening the left and right screws with the portable screwdriver locks it to prevent it from falling off, and it is a full-fledged magnifying eyepiece with a lock to prevent the 1.3x lens from loosening.