Fotasy MANGSB Focal Reducer Speed Booster Adapter Nikon G AFS Lens to MFT Micro 4/3 M43 Camera, Black Increase exposure to 1 stop, and you can use faster shutter speed to shoot an image 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 2 x 0.72 = 72mm. Please note this adapter works with Nikon G Full frame lenses only. No electrical contacts. Exposure and focus has to be adjusted manually. Automatic diaphragm, auto-focusing, or any other functions will not operated with using this adapter With Arca Swiss Type Tripod Ring