specifications:
Focal length: 15mm
Aperture ratio: 1:2.8
Lens construction: 9 groups, 10 elements
Coating: S.S.C. (super spectra coating)
Angle of view: 180 degrees in diagonal

Known as the full-frame fisheye due to its ability to fill up the 24x36mm format, the performance of the FD 15mm f/2.8 is different to that of the 7.5mm fisheye or a conventional wide-angle lens.

The 15mm fisheye records a full-frame image on 35mm film as opposed to the circular image of the 7.5mm fisheye. While the circular fisheye has a 180° angle of view in all directions, the 15mm fisheye has a 180° angle of view only on the diagonal of the 35mm frame\'s image area of 24mm x 36mm. The 15mm full-frame fisheye also focuses from 0.2 meter (8 in.) to infinity.