Nikon F3HP, 1412059 instruction manual EV Range of the Camera

-EV RANGE OF THE CAMERA-continued-------

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 settings.

The chart on page 35 shows the relationships between the flstop, shutter speed and film speed, indicating the slowest functioning shutter speed (for metering purposes) with any film speed/aperture combination .

Careful attention to the following instructions will assure precise exposure, automatically, over the complete expo- sure control and meter range capability of your Nikon F3.

• Auto exposure control at full aperture

For example, with an fll.4 lens and ASA 100 film, the

34automatic shutter will function down to one second with the lens set at fll.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

• 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 limitations are imposed in this mode.

As lens-to-film distance is increased, the metering range (EV range) changes proportionately . For example, when an fl21ens is used at 2: I reproduction (twice life-size) the effective flnumber is fl5.6. When used at fiB, the effective flnumbe r is fl22.

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 flnuonber of fiB, the shutter speed range would be from 114 second to 112000. Should the light level drop below EV 6, it would be out of the shutter speed range of the meter.

the lens used as long as the lens is set at full aperture

(refer to Table) ..

Using ASA 400 at fll.4, the slowest speed is 114 second; however, as the aperture is closed down, the functioning shutter speed becomes progressively slower until we reach fiB when the slowest speed of eight seconds is functioning.

Table

Slowest shutter speed at full aperture with any lens

ASAspeed		Slowest shutter speed
		(sec.)
6400		1160
3200	(4000)	1130
1600		1115
800		1/8
400		114
200	(160)	112
100 ( 80)		1
50 ( 64)		2
25		4
12		8