Nikon F25B Bedienungsanleitung PDF herunterladen (Seite 26)

EXPOSURE

MEASUREMENT-continued

Eyepiece

Shutter

Operation

The

camera's

Photomic

finder

is

fitted

with an eyepiece

shutter

for special

unmanned

shooting

situations

(e.g.,

remote

control,

automated

shooting

with

motor

drive

and

aperture

control

unit) requiring

protection

against

the

entry

of

stray

light

through

the

viewfinder eyepiece.

To

close

the

shutter,

simply

turn

the

eyepiece

shutter

control

60°

clockwise; as the

shutter

closes,

the

internal

LEDs

are

deactivated

and

the

external

"correct

exposure"

indicator

is

switched

on

for

metering

operation

from

atop

the finder.

To

set

the

camera

for

proper

exposure

using

the

external

LED indicator, simply

adjust

the

aper-

ture

ring

and/or

the

shutter-speed selector until

the

LED

just

glows;

once

the LED comes

on,

the

camera

is

set

for

correct

exposure.

In

addition

to

its use for low-light

metering

or

for un-

manned

photography,

the

eyepiece

shutter

comes

in

handy

to

ensure

correct

exposure

measurement

in

criti-

cal

shooting

situations

(e.g.,

photomicrography)

or

for

protection

against

the

entry

of

bright light

into

the

view-

finder

during

daylight shooting.

26

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 cond itions,

some

corrective

action

must

be taken

to

ensure

proper

exposure

of

the

main subject.

Fortunately,

the

finder's

center-weighted

TTL

metering

action

simplifies

adjustments,

making for qu icker camera

operation

and

more

accurate

final resu Its.

To

compensate

for an excessively

bright

or

dark

back-

ground,

target

the

main

subject

in

the

center

of

the

fo-

cusing screen wh

ile

performing

metering; th

is

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,

recompose

to

the

desired

picture

composition

and

make

the

exposure

without

readjusting the camera controls.

For

example,

when

shooting

landscapes, it

is

often

advisable to aim

the

camera slightly

downward

during

exposure

measure-

ment

to

eliminate the effects

of

a bright expanse

of

sky;

without

such

compensation,

the

landscape

may

appear

underexposed

in

the

final

print.

Also,

for

backlit

sub-

jects, it may

be

necessary

to

move closer

to

the

subject

to

ensure a

proper

reading.

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