A fisheye lens allows photographers to create images that are simply not possible with any other type of lens. A line in the center of the image remains true while lines outside of the center one will be rendered with a dramatic curve. This particular fisheye Nikkor camera lens has a 7.5-mm fixed focal length and aperture range of f/5.6 � f/22. The Nikon 7.5 mm f/5.6 lens weighs just 11 ounces, so it can easily be added to a photographer�s arsenal without adding extra bulk. This fisheye lens has a viewfinder that must be attached to the user�s camera in order to view the images as they are being taken. When using the Nikon 7.5 mm f/5.6 lens users will also have to lock the position of the camera�s mirror to avoid it being broken when the lens is mounted. The non-rectilinear Nikon 7.5 mm f/5.6 lens has a viewing angle of 180 degrees so it can capture subjects far above, below, and to the side of the main subject. This fisheye Nikkor camera lens is compatible with Nikon F, F2, F3, F4, and F5 film cameras.