Nikon AI-S Zoom-Nikkor 25-50mm f/4 Руководство по эксплуатации - Страница 8

Просмотреть онлайн или скачать pdf Руководство по эксплуатации для Объектив камеры Nikon AI-S Zoom-Nikkor 25-50mm f/4. Nikon AI-S Zoom-Nikkor 25-50mm f/4 27 страниц.

Печатать страницу

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

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

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