This auto focus circular fisheye lens has an angle of view of 180 degrees in all directions it is exclusively designed for digital slr cameras with the aps c size image sensor when used in conjunction with digital slrs with aps c size image sensors it produces circular fisheye image within the frame the fast f28 maximum aperture produces a bright image in the viewfinder making this lens ideal for low light photography it is equipped with an inner focusing system that creates high definiti