I have two large fish eye lenses from a custom video projection system. Each lens comes with a threaded mounting cell and aluminum lens cap. Focusing the lens is accomplished by screwing the lens barrel into the cell. The barrel of the lens has many fine threads to allow for precise focus. Here are the specifications:
Focal Length = 43 mm
Focal ratio = 2.8
Field of view = 160 degrees
Eye lens or aperature diameter = 4.5 in.
Field lens diameter = 11 in.
Number of optical elements = 12
Weight with cell = 58 pounds
This lens could make an interesting fish eye sky camera for capturing the night sky for such things as meteors, aurora, and other wide angle events. The buyer would need to adapt a 4x5 film holder or similar camera back. I have more pictures and some design documents available for serious inquiries only.
Sorry, I will ship to US address only. I will deliver lens within 100 mile radius of Salt Lake City. Buyer to pay all shipping, packing, and insurance charges which could be substantial. Buyer can also arrange to purchase and pickup at 2002 Riverside Telescope Makers Conference Memorial Day weekend.
Sale price is $850 each. I accept Paypal or money order. I will also consider trading one lens for a current Meade ETX 125 or Celestron Nexstar 5 telescope. Either scope must be in very good condition, complete with a field tripod.