Please consult us of your lens and camera mount before purchase to get a 100% right product Suitable for: Lens: Olympus Zuiko OM mount SLR Lens Camera: Canon EOS (EF, EF-S) Mount SLR Camera Note: 'No Lens Attached' - Warning Message Appears If your camera indicated "lens is not properly installed", please modify the camera menu settings. Usually called the "release the shutter the lens is not installed", you can modify the settings to be allowed. Specifically refer to the camera manual Infinity focus position: the position of the infinity mark 【∞】of the telephoto lens or super telephoto lens is shifted slightly to the positive side to enable focus adjustment even when focus shift is caused due to temperature changes. The shift range is denoted by an L-shaped line, Be sure to check the focus through the viewfinder even when you shoot at infinity. If your lens does not have a manual aperture control ring, it will stop down to its smallest f/stop by default. After Sales Service: Please contact our professional after sales team for video help or technical support in needed