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EV= camera exposure settings
+-Ev= increase/decrease luminous exposure?
(或相反?)
Source
Many current cameras allow for exposure compensation, and usually state it in terms of EV (Ray 2000, 316). In this context, EV refers to the difference between the indicated and set exposures. For example, an exposure compensation of +1 EV (or +1 step) means to increase exposure, by using either a longer exposure time or a smaller f-number.
The sense of exposure compensation is opposite that of the EV scale itself. An increase in exposure corresponds to a decrease in EV, so an exposure compensation of +1 EV results in a smaller EV; conversely, an exposure compensation of −1 EV results in a greater EV. For example, if a meter reading of a lighter-than-normal subject indicates EV 16, and an exposure compensation of +1 EV is applied to render the subject appropriately, the final camera settings will correspond to EV 15.
說真的有點容易混淆。
EV本來就可以由luminance跟illuminance(還有ISO speed)決定。+-EV應該是指真實luminance與相機所被設定參數之間的差距吧?
EV高表示(環境)亮度高，+EV表示提高畫面亮度，這樣的確是直覺許多，至於EV到底真實值是多少則是測光表的事...
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