I am trying to figure out how to defish my images in Panorama tools. I use an 8mm Sigma cirkular fisheye on a Canon 20D. I don't have much experience using PT, and I have fiddled for hours with the "adjust" filter. I can't seem to find the right way to stretch the image so that only the corners need to be cropped out. I can only get a cylinder like a "semi-fisheye", or a rectilinear with only a very small part in the middle usable. Is there anyone out there with experience of 8mm fisheyes who can help?