| Year | 1980 |
| Lens Groups | 9 |
| Lens Element | 10 |
| Aperature Blades | 6 |
| Minimum Aperture | f/22 |
| Closest Focusing | 0.2 m |
| Max. Magnifcation | 1:7.1 (0.14x) |
| Filter Size | - |
| Diameter x Length | 76 x 60.5 mm |
| Weight | 460 gr (1.01 lb) |
| Hood | - |
I love the look of a full-frame fisheye more so than the circular fisheye. The image quality is excellent wide open and super sharp at f5.6-16. It can focus very close to the subject--just inches away. It has four built in filters: Sky, Y3, Orange and Red making it perfect for black and white film photography. I have only used this lens with film cameras (New F-1, T90, T70). The permanent hood helps to protect the lens but does little to stop light flares. But with a 180-degree diagonal view any other hood would interfere with the image. One needs to be careful with tuck in the elbows when shooting as the field of view is so wide. The angle that the camera is held determines if there is any distortion at the edges or across the horizontal. You can choose to bend the horizon convex or concave or not at all. I chose this lens over the 17mm f4 for the extra stop. I also have the 20mm f2.8 if I am concerned about distortion. It has some weight to it because it is well built. Minimum aperture is f22.
exellent Fisheye, with verygood sharpness overall.