I have a Nikon-mount Sigma 8mm Circular fisheye that I am considering trying to use on one of my Olympus OMDs. If I were to purchase a Vizelex ND Throttle Lens Mount Adapter from Fotodiox Pro and mount it with the Sigma fisheye, what type of image would I get? On my full-frame Nikons, the image is a complete circle within the frame (corners are black.) I am guessing on the smaller four-thirds sensor, I would get a complete frame but containing only part of the image? Does anyone have any experience with this or a similar combination? Is my reasoning wrong? TIA!