Viltrox Canon EF EOS to Sony E Nex Electronic Auto Focus Mount Adaptor Reducer 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 1.5 x 0.72 = 54mm. Auto-focusing , electronic aperture & IS possible