light reaching the film造句

The process of splitting the image reduced the amount of light reaching the film stock.
The cassette had a built-in dark slide to prevent stray light reaching the film when the disc was removed.
The total amount of light reaching the film plane ( the'exposure') changes with the duration of exposure, aperture of the lens, and on the effective focal length of the lens ( which in variable focal length lenses, can force a change in aperture as the lens is zoomed ).
The f-stops that might be found on a typical lens include 2.8, 4, 5.6, 8, 11, 16, 22, 32, where going up " one stop " ( using lower f-stop numbers ) doubles the amount of light reaching the film, and stopping down one stop halves the amount of light.
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