needing the meter after a while. This is because the same number pops up for each subject each time. LVs eliminate the confusing issues of film speeds and f/stops that hide these simple truths when using SLRs or other light meters:
LV18 and above: Bright reflection off a sunlit object, including reflections off the sea LV17 White object in full sunlight
LV16 Light gray object or skin in full sunlight
LV15 Gray card in full sunlight; typical exposure for ugly
LV14 Typical light level for
LV12 California bright overcast LV11
LV10 Dark, dreary overcast day in Boston, London or Paris LV 9
LV 8
LV 7 Typical indoors; light outdoors about 10 minutes after sunset LV 6
LV 5
LV 4
LV 3 Brightly lit night street scenes LV 2 Typical night street scenes LV 1 Dark scenes outdoors at night
LV 0 LV Zero is defined as the light level that requires a 1 second exposure at f/1 with ISO/ASA100 speed film.
Some light meters use a similar scale, but shifted by a constant amount. For instance, the Gossen
Exposure Value, or EV, varies from LV, or Light Value, depending on your film speed.
EV = LV at ISO 100
With ISO/ASA 100 speed film you expose with an Exposure Value (EV) equal to the Light Value (LV).
Easy, eh? Your meter will do this for you, but you can do it in your head, too, if you forget your meter. Here's how:
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