Nikon fe - Manual (Page 34)

EV RANGE OF THE CAMERA
he 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 35 shows the relationships between
the f-stop, shutter speed and film speed, indicating the
slowest usable shutter speed (for metering purposes)
with any film speed/f-stop combination.
Careful attention to the following instructions will as­
sure precise exposure, automatically, over the complete
range of your Nikon FE.
■ 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 down.
Using ASA 25 film as a standard, you may be assured of
at least a four-second speed regardless of the aperture of
the lens used as long as the lens is set at full aperture
(refer to table).
With ASA 400 film at f/1.4, the slowest speed is 1/4
second; however, as the aperture is closed down, the
usable shutter speed becomes progressively slower until
we reach f/8 when the slowest speed of eight seconds is
possible.
■ Auto exposure control with stop-down metering
When using a bellows or other extension equipment
which does not couple directly to the exposure meter, it
is necessary to use 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 lens is used at a 2:1 reproduction ratio (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 low-light levels, it is
desirable to use a high-speed film (ASA 160 or higher).
Using Tri-X at ASA 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.
Slowest shutter speed
at full aperture with
any lens
ASA speed
Slowest shutter speed
(sec.)
3200 1/30
1600 1/15
800 1/8
400 1/4
200 (160) 1/2
100 { 80) 1
SO ( 64) 2
25 4
12 8
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