NOMENCLATURE 1 Focal Length/Aperture Index 9 Meter Coupling Shoe
2 Distance Scale 10 Aperture-Direct-Readout Scale
3 Distance Scale Index Line 11 Aperture Indexing Post for Nikon
4 Infrared Compensation Scale SB-E Speedlight
5 Focusing Ring 12 Aperture Scale
6 Focal Length Scale 13 Meter Coupling Ridge
7 Zooming Ring 14 Aperture Ring
8 EE Servo Coupling Post
FOREWORD This 25-50mm f/4 lens is a retro-focus zoom lens featuring 11 elements in
10 groups. It offers the benefits of a wide-angle 25mm lens with continuous
zooming up to 50mm. It is well constructed and designed to correct all aber-
rations, especially barrel distortion which is a common problem in wide-angle
zoom lenses. Although a zoom lens, its optical performance will challenge that
of fixed focal length lenses for sharpness and image clarity throughout its
entire focal range. Both zooming and focusing are accomplished through two
independent rings—minimum focusing distance is 0.6m, Multilayer Nikon
Integrated Coating on all air-exposed lens surfaces helps reduce reflection,
thus minimizing flare and ghost to insure greater image contrast and color
rendition.
Among the applications best suited for this lens are press photog-
raphy and general subject shots.
MOUNTING A Position the lens in the camera's bayonet mount, aligning the aperture index of
the lens with the mounting index of the camera. Twist the lens counterclockwise
until it clicks into place. To remove, depress the lens release button on the
camera body and twist the tens clockwise.
When mounting the lens on the camera with a 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.
FOCUSING B To focus, rotate the focusing ring until the image in the viewfinder appears
sharp and crisp. Once your subject is in focus, you are then ready to zoom. The
subject will remain in focus throughout the entire zoom range. For pinpoint
focusing,
use the maximum focal length and then reduce the focal length for the
desired picture composition.
You can prefocus the lens by using the distance scale markings which are
engraved,
both in meters and feet, on the focusing
ring.
Turn the focusing ring