# Minolta Fish-Eye Rokkor 16mm f/2.8

The Fish-Eye Rokkor 16mm f/2.8 is a prime fisheye lens produced by Minolta for Minolta SR-mount single lens reflex cameras, introduced in 1969 to replace an earlier fisheye lens, the UW Rokkor 18mm f/9.5. It is a full-frame fisheye lens with a 180° viewing angle across the diagonal.
This lens was licensed by Leitz and released for Leica R mount cameras as the Leica Fisheye-Elmarit-R 16mm f/2.8; it also was released as an autofocus lens for Minolta A-mount system cameras.

## Design and history

Minolta updated the design several times during the course of production:
* 1969: MC Fish-Eye Rokkor-OK 16mm f/2.8
* 1973: MC Fish-Eye Rokkor(-X) OK 16mm f/2.8
* 1977: MD Fish-Eye Rokkor(-X) 16mm f/2.8
* 1978: MD Fish-Eye Rokkor(-X) 16mm f/2.8
* 1980: MD Fish-Eye Rokkor(-X) 16mm f/2.8
* 1981: MD Fish-Eye 16mm f/2.8
The original design, by Toshinobu Ogura, used 11 elements in 8 groups, as designated by the -OK suffix. Lenses sold in the United States starting in 1973 were given Rokkor-X branding. Most of the updates since the original release were cosmetic, aside from the 1980 update, which changed the design to 10 elements in 7 groups and reduced the size and weight, designed by Mitsuaki Horimoto.
The 11e/8g Ogura design was licensed by Leitz and assembled by Minolta for Leica R-mount cameras; the Fisheye-Elmarit-R was released in 1974 and continued in production until 2001. When the Minolta A-mount system was released in 1985, the 11e/8g Ogura design was revived as an autofocus lens, the Minolta AF Fish-Eye 16mm f/2.8 (1986). Production of this lens continued after the A-mount system was purchased by Sony.
Due to the extreme angle of view, the front of the lens does not have a mount for filters; four filters for black-and-white and color photography are built in and selected by a rotating dial near the front on the body of the lens. Filter selection varies by the lens design. The 1969 version includes normal/UV (1A), orange (O56), yellow (Y48), and cooling (80B) filters.
Minolta 16mm fisheye lenses for SR-mount :
| ModelSpec | ModelSpec | MC Fish-Eye Rokkor-OK 16mm f/2.8$^{:IV-45}$ | MC Fish-Eye Rokkor(-X) OK 16mm f/2.8 | MD Fish-Eye Rokkor(-X) 16mm f/2.8 | MD Fish-Eye Rokkor(-X) 16mm f/2.8 | MD Fish-Eye Rokkor(-X) 16mm f/2.8 | MD Fish-Eye 16mm f/2.8 |
| Year | Year | 1969 | 1973 | 1977 | 1978 | 1980 | 1981 |
| Construction | Diagram | | | | | | |
| Construction | Elements | 11 | 11 | 11 | 11 | 10 | 10 |
| Construction | Groups | 8 | 8 | 8 | 8 | 7 | 7 |
| Aperture | Aperture | f/2.8–16 | f/2.8–16 | f/2.8–22 | f/2.8–22 | f/2.8–22 | f/2.8–22 |
| Min. focus | Min. focus | 0.3 m (11.8 in) | 0.3 m (11.8 in) | 0.3 m (11.8 in) | 0.3 m (11.8 in) | 0.25 m (9.8 in) | 0.25 m (9.8 in) |
| Metering features | Meter coupling (MC) tab | Yes | Yes | Yes | Yes | Yes | Yes |
| Metering features | Minimum diaphragm (MD) tab | No | No | Yes | Yes | Yes | Yes |
| Metering features | Aperture lock | No | No | No | No | No | Yes |
| Dimensions | Diam. | 73 mm (2.9 in) | 70.6 mm (2.8 in) | 70.6 mm (2.8 in) | 70.6 mm (2.8 in) | 64.5 mm (2.5 in) | 64.5 mm (2.5 in) |
| Dimensions | Length | 63.5 mm (2.5 in) | 63.5 mm (2.5 in) | 63.5 mm (2.5 in) | 63.5 mm (2.5 in) | 43 mm (1.7 in) | 43 mm (1.7 in) |
| Dimensions | Weight | 445 g (15.7 oz) | 440 g (16 oz) | 440 g (16 oz) | 440 g (16 oz) | 265 g (9.3 oz) | 265 g (9.3 oz) |
| Filters | 1A (Normal) | Yes | Yes | Yes | Yes | Yes | Yes |
| Filters | R60 (Red) | No | No | No | No | Yes | Yes |
| Filters | O56 (Orange) | Yes | Yes | Yes | Yes | No | No |
| Filters | Y48 (Yellow) | Yes | Yes | No | No | No | No |
| Filters | Y52 (Yellow) | No | No | Yes | Yes | Yes | Yes |
| Filters | B12 (Blue) | No | No | No | No | Yes | Yes |
| Filters | 80B (Cooling) | Yes | Yes | Yes | Yes | No | No |