THE photometry photometry camera exposure modes, the need to measure the light emerges at the begin

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THE photometry photometry camera exposure modes, the need to measure the light emerges at the beginning of s. Until the twentieth then determined empirically by observing the results of the tests as a consequence of the characteristics of the scenes and photosensitive materials used. MODE is done holding the film: - ORTOCROMÀTIQUES were (only sensitive to the ultraviolet range of the view) red light could be revealed security in the same way that today we can reveal the role balnc and black. you could see literally will be revealed (blackening) IMAGE so, to reach the degree of blackening wish they could disrupt the development process. - Had very low sensitivity long exposure time (minutes) errors as not a failure irreparable (and could be corrected for the developer). - In calculating exposure predominant experience of the photographer. - There are not instruments that measure LIGHT Except the only attempt performed: The ACTINÒMETRE (1888: Hurt & Driffield) The measuring device consisted of a few tables and a rotating cylinder graduated calculation based on a number of variables such as: a) geographic latitude b) time of the year c) The time of day) Etc ... 1932 effectively developed first instruments to measure PRECISION LIGHT. MADE WITH CELL selenium produced a certain amount of electircitat when light is incident. In this mode, a system of pins and graduates could find was what you require plant cell diagram for the correct exposure for a given sensitivity of film THE NEED OF A PRECISION INSTRUMENT FOR MEASURING THE LIGHT OF GIVEN SCENE CAME FOR THE EVOLUTION AND CONSEQUENTIAL perfecting photographic films. These were more sensitive, to also extend the sensitivity to colors, UP RED FILMS panchromatic .) Shorter and more time is needed PRECISSOS.) Could not be revealed LIGHT SEGURTAT, plant cell diagram but TANKS airtight TIME PREVIOUSLY CALCULATED currently plant cell diagram have sophisticated measuring systems built into our cameras allow us to expose properly. But even the most sophisticated are unable to perform well under certain conditions with. THE photometers operate remain the same, then follow plant cell diagram calibrated the same way that 70 years ago: All "SEE" a certain plant cell diagram kind of scene that corresponds to a type of callers GREY GREY MEDIUM. Measured with the camera plant cell diagram should be noted that the reflected light photometer built our camera always shows the same, ie; the same kind of scenes for which has been calibrated: Those that reflect 18% of light impinging. This results in a gray half of it when we leave the same type of such scenes (roughly plant cell diagram 80%) all photometers "fail." MEASUREMENT OPTIONS: 1) with central prepoderància 2) timely 3) matrix (evaluative or segments) 1) measured preponderance CENTRAL: Emphasized the center of the frame. Show errors or problems: a) if the main subject is not the center of the image b) landscapes, because the light from the sky is more intense than reflecting terre are recommended exposure and modify the frame. 2) Metering: Similar to the above, but in a narrower angle (corresponding to the innermost concentric circle in the viewfinder) In expert hands is useful for evaluating the resistance and take measures and independent and you require to: - umes - shadows - midtone 3) MEASURE plant cell diagram MATRIX: The cameras more advanced and generally, the SLRD consists plant cell diagram of dividing the frame into a number of segments (from 6'21 to 1005 NIKON areas that matter) in which are individual measures will be evaluated and processed by the system to give a proper exposure.
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