Nikon N70 Instruction Manual - Page 46
Exposure
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EXPOSURE MODE Light reaching the film is controlled by shutter speed and lens aperture. The proper combination results in a correct exposure. Shutter speed and lens aperture settings are based on the ISO speed set for the film in use and the operation of the camera's exposure control system. The relationship between aperture and shutter speed is as follows: One change in shutter speed either doubles or halves the amount of light transmitted . For example, a shutter speed of 1/ 500 sec. passes half the light of 1/250 and double the light of 1/ 1000 sec. The aperture f/8 passes half the light of f/ 5.6 and double the light of fl11 . If the correct exposure for a scene is 1/ 500 at f/8 , then we can also select 1/ 250 at f/ 11 or 1/ 1000 at fl5.6 and achieve the same exposure results, and so on. SELECTING EXPOSURE MODE Selecting the exposure control mode means deciding if you want the shutter speed andl or lens aperture to be set automatically or manually. The Nikon N70 camera offers two types of programmed auto exposure modes, Auto-Multi Program (P) and Vari- Program (Ps), as well as Shutter-Priority Auto (5), Aperture-Priority Auto (A), and Manual (/"I) exposure modes. 46