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Unformatted text preview: 9-24-07Exposure MetersWhy meter?Cant I sue the rule of thumb to do this?Under direct sunlight f/16 at 1/film speed*Can I adjust from there?f-stops1.4,2,2.8,4,5.6,8,11,22each is halving of the previous stophere f/22 is the smallestf-stop is the ratio of diameter of the aperture and the focal length of the lens in mmsmaller your aperture the larger your depth of field as your # for aperture get smaller the holes get largershutter speed 1/100, 1/500, 1/250,1/125,1/60,1/30,1/15, 1/8,1/4, all are fractions of a secondeach is a doubling of the previous readingmeter scalesearly photoelectric meters were calibrated in footcandles or candelas per square foot of illuminance readingsalternatively calibrated with numbers that represented relative positionratio scale (1,2,4,8,16)each number represents a doubling of the light form the previous readings, or one stop increasecontemporary meters use a calibrated scale such as an interval scaleinterval scale (1,2,3,4,5,6) (EV)once again here, each luminance ratio of brightest high light to darkest shadowcan give you insight about the result of your image...
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- Fall '07