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Light Value represents the corresponding relative 'brightness level', so to speak, which then would require the appropriate proper corresponding exposure.
Micromat drive scope reviews iso#
The number 100 is NOT a special ISO number at all, Light Value could compare by converting both readings to any same ISO number, but 100 is merely a popular convenient number. Light Value converts the ISO to an arbitrary but standard ISO 100 value for the purpose to compare two actual exposures at the same ISO 100 values. The camera settings are not necessarily a correct exposure unless ISO does match them to the scene. So maybe the formula to calculate EV does not include the ISO number, but of course the choice of the proper camera settings used of course depends on ISO. The settings combination of f/16 at 1/125 second is numerically EV 15 for any ISO, but of course, those settings are chosen and only applicable for the one specific ISO currently being used.
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This ISO number was identified to the camera, so the metering knew it and could compute how much the camera settings needed to change to match exposure to this film speed. Then film speed (called ASA then, ISO today) was a temporary constant determined by the roll of film in the camera. Numerical EV was developed when light meters were to be added into film cameras (late 1950s) to aid computing exposure. The EV number is computed from the camera settings applicable to whatever appropriate ISO is in use, which makes ISO in fact be all important. The camera settings EV term might be misunderstood, because it is computed from only the shutter speed and f/stop values (a calculator is on next page).