Does anyone know the actual size in mm of the image circle? I can't find it in the specs or in any review. I know it was made for 4/3 sensors but I would like to at least consider any merits of adapting it to full frame (Sony Alpha A7R). Even if it did not give a usable full-width, full frame image, it might give a larger one (to be cropped) than on 4/3 or m4/3 and the perspective would be different. As the lens is operated totally "by wire", even in manual mode, it would have to be via a rather expensive adapter.