| Minolta UW Rokkor-PG 18mm f/9.5 | |
| Maker: | Minolta |
| Feat-Usm: | n |
| Feat-Macro: | n |
| Feat-Special: | Fisheye |
| Flength: | 18mm |
| Aperture: | 9.5-22 |
| Groups: | 5 |
| Elements: | 7 |
| Close-Dist: | fixed |
| Filter: | Rear |
| Hood: | Bayonet Flower |
| Av-Diag: | 180° |
| Start: | 1966 |
| Stop: | 1969 |
| Successor: | Fish-Eye Rokkor 16mm f/2.8 |
| Msrp-Currency: | USD |
The UW Rokkor 18mm f/9.5 is a prime fisheye lens produced by Minolta for Minolta SR-mount single lens reflex cameras, introduced in 1966 as the system's first fisheye lens. It is a full-frame fisheye lens with a 180° viewing angle across the diagonal, and was replaced when the Minolta Fish-Eye Rokkor 16mm f/2.8 lens was released in 1969.
Unlike most contemporary fisheye lenses from other camera manufacturers, the UW Rokkor-PG did not require the reflex mirror to be locked up, so the SLR viewfinder could be used. It is a fixed-focus, manual diaphragm lens; the only control on the lens is the aperture, which may be set between and 22. The flower hood is mounted via the same internal quarter-turn bayonet used to secure the front lens cap.
In 1968, the suggested retail price was, including case.
Due to the extreme angle of view, the front of the lens does not have a mount for filters; threaded filters attach to the rear of the lens. The lens was provided with UV and yellow (Y48) filters. Later, a red filter was available separately.[1] Although corporate literature describes it as a 6-element, 4-group lens, the suffix (-PG) indicates it is a 7-element, 5-group lens, meaning the filter is considered part of the optical design.[2]