Nikon FM2 User Manual
Page 28
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The amount of light reaching the film plane is determined by a
combination of the shutter speed and the lens aperture. A
shutter speed of 1/500 sec. lets in twice as much light as a set
ting of 1/1000 sec., and only half as much light as 1/250 sec. An
aperture setting of f/11 lets in twice as much light as f/16, half as
much as f/8. Thus, if the correct exposure for a particular
picture-taking situation is 1/500 at f/11, then 1/250 at f/16 or
1/1000 at f/8 will give the same exposure. It is very convenient
to know this interrelation when considering depth of field. The
following table illustrates the interrelation between shutter
speed and aperture.
Exposure determination
Shutter
speed
(sec.)
1/4000
1/2000
1/1000
1/500
1/250
Aperture
(f/number)
4
5.6
8
11
16