[netofworld]

各位師兄姊
灰卡在那買平及什麼牌子好(色準)及怎樣用較準又白卡好還是灰卡好有什麼分別Thankyou!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[lojasonkachun]

18% 灰色

[hktsoi]

問大家一個問題, 點解灰卡要用18%而不是50%, 18%的意思又是什麼

[ecnfung]

Metering systems are calibrated to a certain light value in order to gurantee constant exposure settings: 18% gray is commonly accepted because a typical scene seems reflect the same amount of light as this gray value. As a framework for comparison all these colors reflect light like 18% gray:

take a look this site

http://www.photozone.de/Technique