Sigma 8mm F4 EX
Launched September 1999

Sigma 8mm F4 AF EX Circular Fisheye Lens

The 8mm F4 EX autofocus lens produces a circular fisheye image on film which gives a 180° view in all directions. This type of lens was originally designed to photograph the entire sky but can also be amalgamated into various scientific instruments including flight simulators. It is also well suited for use with QTVR and other Internet virtual reality techniques. There is a small but important demand for this lens in the research departments of many academic and commercial organisations. As budgets become ever tighter this lens at £599.95, is a very attractive alternative to OEM lenses.

Specifications
Construction 10 Elements in 6 Groups
Focal Length 8mm
Maximum Aperture ƒ4
Minimum Aperture ƒ32
Field of View 180°
Minimum Focus Distance 20cm
Number of blades 5
Maximum Magnification 1:13.9
Zooming System N/A
Filter Size Rear Gelatin Type
Diameter 73.5mm (max.)
Length 61.8mm
Weight 320g
SRP at launch: £599.95
Available Mounts: Sigma SA, Nikon (D), Pentax, Canon