Nikon Nikkormat FT3 Instruction Manual - Page 10

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EXPOSURE CONTROLS

The amount of exposure the fUm receives is determin-

ed by a combination of shutter speed and aperture.

The larger the lens aperture, the more exposure. Like-

wise, the slower the shutter speed the greater the

exposure. Aperture is expressed in f/numbers with

larger numbers representing smaller apertures and vice

versa. For example, f/8 gives twice as much exposure

as f/11. Shutter speed is expressed in seconds or

fractions of a second. The numbers on the Nikkormat

shutter-speed scale are reciprocals of the actual speeds

(250 represents 1/250 second

etc.)

Camera aperture and shutter-speed controls are cal-

culated so that an increase of one f/number com-

pensates for a one-step decrease in shutter speed. For

example, 1/250 at f/8 is equivalent to 1/125 at fIll.

The table below shows how aperture and

shutter-

speed are interrelated. All the combinations give the

same exposure.

Aperture

f/1.4

f/2

f/2 .8

f/4

f/5 .6

Shutter speed

1/500

1/250

1/125

1/60

1/30

(seconds)