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9 Aperture-Direct-Readout Scale
10 Aperture Indexing Post
11 Meter Coupling Ridge
12 Aperture Ring
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.
10
MOUNTING THE LENS--------------------------------------------------------------A
Position the lens in the camera’s bayonet mount, aligning the mounting
indexes on the camera and the lens. Twist the lens counterclockwise until it
clicks into place.
To remove, depress the lens release button on the camera and twist the lens
clockwise.
Note; When mounting the lens on a camera with a iift-up meter coupling lever {Al
type), make sure that the camera’s meter coupling lever is correctly positioned; when
mounting on a camera without this lever (non-AI type), “manual” maximum aperture
indexing is required. In both cases, refer to the camera’s instruction manual.
Caution: Keep the accessory front lens cap in place when mounting or removing the
lens and when loading or unlocading film. Always replace this cap when the lens is not
in use to prevent damage to the lens surface.
AUTOMATIC APERTURE DIAPHRAGM
The Fisheye-Nikkor’s automatic diaphragm couples directly to the TTL
meter of all Nikon cameras for full aperture exposure measurement via a
meter coupling ridge for Al cameras or a meter coupling shoe for non-AI
cameras. The aperture ring has click-stop settings for each full f-stop from
f/2.8 to f/22 and can also be set to intermediate openings for more precise
exposure. An “aperture-direct-readout” scale is also engraved on the lens to
allow direct reading of the aperture setting in suitably equipped camera
finders. The procedure for exposure measurement is similar to that used
with other Nikkor lenses. For details see the instruction manual supplied
with your camera.
The Fisheye-Nikkor 8mm f/2.8 focuses all the way from infinity down to
one foot (0.3m). This means you can focus on foreground objects while
throwing the background out of focus or move in close to the subject with
out stopping down the lens.
To focus, look through the camera viewfinder and turn the focusing ring
until the image on the screen appears needle sharp. The automatic diaphragm
feature and wide f/2.8 maximum aperture guarantee the brightest possible
images for viewing and focusing, even in dim light. Depth of field can be
observed by simply pressing the camera’s depth-of-field preview button or
by referring to the table on page 33.
11
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