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# 9-24 - Exposure Meters Why meter Can't I sue the rule of...

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9-24-07 Exposure Meters Why meter? Can’t I sue the rule of thumb to do this? Under direct sunlight f/16 at 1/film speed* Can I adjust from there? f-stops 1.4,2,2.8,4,5.6,8,11,22 each is halving of the previous stop here f/22 is the smallest f-stop is the ratio of diameter of the aperture and the focal length of the lens in mm smaller your aperture the larger your depth of field as your # for aperture get smaller the holes get larger shutter speed 1/100, 1/500, 1/250,1/125,1/60,1/30,1/15, 1/8,1/4, ½ all are fractions of a second each is a doubling of the previous reading meter scales early photoelectric meters were calibrated in footcandles or candelas per square foot of illuminance readings alternatively calibrated with numbers that represented relative position ratio scale (1,2,4,8,16) each number represents a doubling of the light form the previous readings, or one stop increase contemporary meters use a calibrated scale such as an interval scale interval scale (1,2,3,4,5,6) (EV) once again here, each luminance ratio of brightest high light to darkest shadow can give you insight about the result of your image flat contrasty

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