Some shots by this lens http://galleries.oomz.net/pub/M42/russian/peleng8mm/index.html
The Peleng 3.5/8 mm fisheye lens is available to fit for Nikon AI & F, Canon EF or FD, Minolta MD or AF or Maxxum, Pentax M-42 or K, Olympus & Contax/Yashica SLR cameras via lens adapters.(need to confirm this though)
It is compatible with autofocus cameras when the camera is used in the manual focus mode.
Specifications:
Focal length8mm
Field of view
180 degrees, provides a circular image (not a full-frame image) on 35mm film
Filter size
26.5mm, mounts to rear element
Aperture scale
f3.5 to f16
Price Range S$500 to S$550 depending on the mount (Including Adapter & Shipping)