Camkitmate Focal Reducer Speed Booster Adapter Canon EOS EF Lens To Micro 4/3 Cameras In common lens adapters, cropping effect occurs in all APS-C digital cameras with 1.5x magnification. This adapter reduces focal length to 0.72x , to adjust the image size to near 1:1 so that the focal length of the image is close to actual focal length of the lens, e.g. 50mm x 1.5 x 0.72 = 54mm. For using Micro Four Thirds (M4/3) mount digital cameras with all Canon EOS EF Lens. Allows focus infinity. Switching camera to "Shooting without lens" mode is essential. It helps to increase the maximum aperture to 1 stop, and you can use it faster by 1 stop. The depth is about 7mm, may hit the sensor of some cameras such as G1. There is no electronic integration, no auto fucusing Compatible: All Canon EOS EF Lens All Micro 4/3 Camera,such as Panasonic Lumix GX7 GF6 GF3 GF2 GH2 GF1 G10,Olympuc OM-D E-M1 E-M5 etc.This adapter DOES NOT compatible with Black Magic Pocket Camera Package Included: 1 x Canon EOS-M4/3 adapter 1 x Front & Rear Caps