Nikon Nikon Nikomat FT manual Relationship Between Shutter Speed and Aperture, Aperture f-number

TECHNICAL INFORMATION/PHOTOGRAPHY TECHNIQUES continued

RELATIONSHIP BETWEEN SHUTTER SPEED AND APERTURE

Shutter Speed (sec.)	1/4000	1/2000	1/1000	1/500	1/250	1/125	1/60	1/30
Aperture (f-number)	1.4	2	2.8	4	5.6	8	11	16

The amount of light reaching the film plane is determined by a comb nation of shutter speed and lens aperture. A shutter speed of 1/125sec. Iets in twice as much light as a setting of 1/250sec and only half as much light as 1/60sec 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/4, then 1/250 at f/5.6 or 1/125 at f/8 will give the same exposure.

The table above is one example showing the interrelationship between shutter speed and aperture. Each combination produces correct exposure but the effects of the pictures are quite different. The best combination will depend on the results you want. Fast shutter speeds freeze motion while slow speeds produce a deliberate blur. Also, small apertures give greater

depth of field, while large apertures restrict the zone of sharp focus to the main subject. (Refer to page 48 for details on depth of field.)

A good rule to follow in preventing camera shake is to select a shutter speed which is never slower than the reciprocal of the focal length of the lens in use For example, when using a norma 50mm lens, select a speed no slower than 1/60sec (the closest number to 1/50). For a 200 mm super-telephoto, use no less than 1/250 sec., and so forth.

If a slow shutter speed is necessary or the camera selects one in the automatic exposure modes, attach the camera to a tripod As an alternative, use an electronic f ash or change to faster film

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