[Schuler]

有D關於EV值嘅問題想請教各位師兄。
在網上和一些攝影雜誌見到EV值的資料：在固定的ISO之下(e.g. ISO100) 每一個EV值(-5至20不等)都有不同嘅光圈、快門組合。
請問怎樣量度拍攝現場嘅EV值呢？
呢個EV值和我們在相機裏常用嘅+/- EV又有沒有關係呢？

[lokism3]

1. EV (exposure value) is the unit to measure "brightness" for photography.

2. "不同嘅光圈、快門組合" can do a "一個EV值",
e.g. f/8, 1/60s = f/5.6, 1/125s = f/4, 1/250s... etc.

3. "+/- EV (exposure compensation)" is not directly related to the EV
we use when you want to adjust the reading (setting) from camera,
e.g. in manual mode:
reading f/8, 1/60s, if +1 EV = f/5.6, 1/60s or f/8, 1/30s
if -1 EV = f/11, 1/60s or f/8, 1/125s