Nikon EH EL2 User Manual download pdf (Page 35)

EV RANGE OF THE CAMERA

The camera's meter may be

used

only within the shutter

speed range covered by the exposure value (EV) range

of the meter, which varies with the aperture and ASA

setting.

The chart on page 37 shows the relationships between

the f-stop, shutter speed and film speed, indicating the

slowest functioning shutter speed (for metering pur-

poses) with any film speed/f-stop combination.

Careful attention to the following instructions will as-

sure precise exposure, automatically, over the complete

exposure control and meter range capability of your

Nikon EL2.

• Auto exposure control at full aperture

For example, with an f/1.4 lens and ASA 100

film,

the

automatic shutter will function down to one second

with the lens set at 1.4, and proportionately slower as

the aperture is closed.

Using a standard of ASA 25

film,

you may be assured

of at least a four-second

speed

regardless of the aperture

of the lens used as long

the lens is set at full aperture

(refer to Table).

Using ASA 400 at f/1.4, the slowest

speed

/4 second;

however, as the aperture is closed, the functioning shut-

ter speed becomes progressively slower until we reach

f/8 when the slowest speed of eight seconds

function-

ing.

• Auto exposure control with stop-down metering

When using a bellows or other extension equipment

which disengages the meter coupling device, it is neces-

sary to revert to stop-down metering. Certain limita-

tions are imposed in this mode.

As lens-to-film distance is increased, the metering range

(EV range) changes proportionately. For

example,

when

an f/2.0 lens is used at 2:1 reproduction (twice life-size)

the effective f/number is f/5.6 When used at f/8, the

effective f/number is f/22.

When pictures are taken under minimal light levels, it is

desirable to use a high-speed film (ASA 160 or higher).

Using Tri-X at film speed 400 with stop-down metering,

with an effective f/number of f/8, the shutter speed

range would be from 1/4 second to 1/1000. Should the

light level drop below EV 6, it would be out of the

shutter speed range of the meter.

Table Slowest shutter speed at full

aperture with any lens

ASA speed

3200

1600

800

400

200(160)

100 ( 80)

50 ( 64)

Slowest shutter speed

(sec.)

1/30

1/15

1/8

1/4

1/2

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 47 48

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Nikon EH EL2 User Manual Page 35

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