Sigma 8mm F4
Launched September 1992
Sigma Fisheye 8mm F4 Lens
Sigma fisheye lens 8mm f/4 is rendering 180 degree circular image of 22mm. It is equisolid angle projection type fisheye lens. This lens can be used for measurement of clouds etc.
| Specifications | |
| Construction | 11 Elements in 7 Groups |
| Focal Length | 8mm |
| Maximum Aperture | ƒ4 |
| Minimum Aperture | ƒ22 |
| Field of View | 180° |
| Minimum Focus Distance | 20cm |
| Number of blades | 5 |
| Maximum Magnification | N/A |
| Zooming System | N/A |
| Filter Size | 22.5mm |
| Diameter | 73.5mm (max.) |
| Length | 59.5mm |
| Weight | 375g |
| SRP at launch: | N/A |
| Available Mounts: | Canon, Nikon, Minolta, Pentax, Olympus, Ricoh, Contax, Yashika, Praktica-S, Praktica-B |