Nikon FM2 User Manual

Page 28

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

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)

5.6