N O M E N C L A T U RE
1 | Aperture Index | 8 | EE Servo Coupling Post |
2 | Distance Scale | 9 | Aperture-Direct-Readout Scale |
3 | Distance Index | 10 | Aperture Indexing Post |
4 | Focusing Ring | 11 | Meter Coupling Ridge |
5 | Filter Selector Dial | 12 | Aperture Ring |
6Aperture Scale
7Meter Coupling Shoe
FOREWORD
The Fisheye-Nikkor 8mm f/2.8 lens sees and records every object in a full 180° hemisphere—everything in front, above, below and to either side of the lens. Unlike other fisheye lenses, it fits the camera without any need to lock up the reflex mirror and takes full advantage of the reflex viewing feature of all Nikon cameras. The focusing range extends down to one foot to permit pinpoint focusing on foreground objects while throwing the background out of focus at large apertures, and the aperture diaphragm couples with the TTL exposure meters for full-aperture exposure measurement. The wide maximum aperture of f/2.8 means that the viewfinder image is extra-bright for easy viewing and focusing even in dim light. A set of five filters is built into the lens barrel.
FISHEYE LENS
Like most fisheye lenses, the Fisheye-Nikkor 8mm f/2.8 covers a 180° hemi- sphere and produces a circular image on film. Barrel distortion is consider- able, since the circumference of the image circle corresponds to a straight line.
The equidistant projection formula (y=C0) is used in order to accommodate this extra-wide picture angle within a field of finite size. The zenith angle (6) of any point in the image recorded on film is proportional to the distance
(y) from the center of the image (see Photogrammetry, Page 12).
Originally designed for scientific applications such as measuring the zenith or azimuth of astronomical bodies, recording cloud distribution patterns in the entire sky or surveying by photogrammetry, the lens is also suited for many other unique requirements. It is used widely for creating special ef- fects, photographing the insides of inaccessible spaces, recording crowd movements in large areas, etc.
