Nikon EH EL2 Bedienungsanleitung PDF herunterladen (Seite 30)

EXPOSURE MEASUREMENT-continued

Metering Range

If the black meter needle fails to leave the "A" or "B"

positions during auto (or fails to "match" the green

needle in manual), even after all possible lens-aperture/

shutter-speed combinations have been

tried,

then the

available light is too bright or too dim for the meter's

range.

To correct this situation, several measures may be

taken,

as follows: Switch to a new film (either higher or

lower ASA) that more closely matches the available

light; mount a neutral density filter on the lens to de-

crease the light reaching the film plane; or use artificial

lighting

(i.e.,

an electronic flash unit) to increase subject

illumination. Remember, too, that the lens in use can

greatly influence suitability for bright or dim shooting.

For example, a 50mm f/1.4 lens (with ASA 100 film)

couples from EV1 (f/1.4 at

second) to EV 18 (f/16 at

1/1000

second) for excellent low-light performance; on

the other hand, a 200mm f/4 lens proves more usable

at bright-light levels, coupling (with ASA 100 film) to

EV20 (f/32 at

1/1000

second). Thus, choose the lens

carefully to match the existing lighting conditions.

High-Contrast Lighting Situations

When there are substantial brightness differences be-

tween the main subject and the background, unimpor-

tant bright spots or dark spots can adversely influence

the finder reading, and thus the final exposure. To pre-

vent under- or overexposure of the main subject under

these shooting conditions, some corrective action must

be taken to ensure proper exposure of the main subject.

Fortunately, the finder's center-weighted TTL metering

action (and the memory lock function in auto) simpli-

fy adjustments, making for quicker camera operation

and more accurate final results.

To compensate for an excessively bright or dark back-

ground,

target the main subject in the center of the fo-

cusing screen while performing metering; this action en-

sures that the main emphasis of the meter reading will

be on the chosen subject. Then, after completing aper-

ture and shutter speed adjustments (and depressing the

memory lock to retain the shutter

speed,

if set to auto),

recompose to the desired picture composition and make

the exposure without readjusting the camera controls.

For example, when shooting landscapes, it is often ad-

visable to aim the camera slightly downward during ex-

posure measurement to eliminate the effects of a bright

expanse of sky; without such compensation, the

land-

scape may appear underexposed in the final print. Also,

for backlit subjects, it may be necessary to move closer

to the subject to ensure a proper reading.

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