Nikon Fisheye-NIKKOR 6mm f-2.8 - Manual (Page 11)

MOUNTING THE LENS---------------------------------------------------A
Position the lens in the camera’s bayonet mount, lining up the aperture
index on the lens with the lens mounting index on the camera. Twist the
camera clockwise until it clicks into place.
To remove, depress the lens release button on the camera and twist the
camera counterclockwise.
Note; When mounting the lens on a camera with a meter coupling lever (Al type),
make sure that the camera’s meter coupling lever is correctly positioned; when mount­
ing on a camera without this lever (non-AI type), “manual” maximum aperture index­
ing is required. In both cases, refer to the camera’s instruction manual.
Caution: Keep the accessory front leather lens cap in place when mounting or remov­
ing the lens and when loading or unloading film. Always replace this cap when the
lens is not in use to prevent damage to the lens surface.
AUTOMATIC APERTURE DIAPHRAGM -B
The Fisheye-Nikkor’s automatic diaphragm couples directly to the thru-the-
lens meter of the Nikon F3, any Nikon F2 Photomic or other Nikon/
Nikkormat camera for full aperture exposure measurement via a meter cou­
pring 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.
FOCUSING------------------------------------------------------------------ C
The Fisheye-Nikkor 6mm f/2.8 lens focuses all the way from infinity down
to 0.9 foot (0.25m). 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 image 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, refer to the table on page 34.
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