Nikon AI-S Zoom-Nikkor 25-50mm f/4 Gebruiksaanwijzing - Pagina 10

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ZOOMING

To zoom in or out, simply turn the zoom ring until the desired composition is

tramed on the focusing screen. The ring has a four-position scale showing which

of five focat lengths—25mm, 28mm, 35mm, 40mm and 50mm—is in use in case

you want to preset the lens to any of these focal lengths.

Caution: Slight vignetting will occur when you shoot with the lens at a small

aperture, at its closest focusing distance and at a wide angle focal length.

DEPTH-OF-FIELD SCALE

Unlike other Nikkor lenses, the Zoom-Nikkor 25-50mm f/4 has no color-coded

depth-of-field indicators engraved on the lens barrel. However, you can still

determine the depth of field by using the scales provided with this pamphlet.

To use, first cut out the scales along the lines indicated. Then, place the sub-

ject-distance scale (B) over the depth-of-field scale (A) with the top edge of ihe

(B) scale lined up with the focal length in use and the focused distance aligned

with the (A) scale's central indicator line. Now read off the numbers (on the B

scale) which appear opposite the pair of depth-of-field lines (on the A scale)

corresponding to the aperture in use; these numbers express the depth of

field lor the settings in use.

For example, if the lens is prefocused at 1.5m (5 ft) with the focal length set at

35mm and the aperture at f/16, the numbers on the distance scale opposite

the depth-of-field lines for the f/16 setting show that the depth of field extends

from 1m (3.511) to 3m (10 It). You can also observe the depth o1 lield through the

viewfinder by pressing the depth-of-field preview button on the camera.

INFRARED PHOTOGRAPHY

The plane of sharpest focus for infrared light is slightly more distant than

its counterpart for visible light as seen through the camera viewfinder. Thus,

for the sharpest focus in infrared photography, adjustments must be made.

The scales provided can be used for determining the amount of adjustment via

the dotted infrared compensation line included.

In the same manner as described in the "depth-of-field scale" section, match

the prefocused subject distance (using the B scale) with the focal length and

aperture scale central indicator line (on the A scale). The distance from the

central indicator line to the dotted compensation line represents the amount of

adjustment required. Now, turn the lens' focusing ring counterclockwise

until the prefocused distance is shifted as prescribed on the scales.