是這本 Nature Photography -- field guide

http://www.amazon.com/Shaws-Nature-Photography-Levels-ebook/dp/B004V422FC/ref=sr_1_2?ie=UTF8&qid=1341940796&sr=8-2&keywords=john+shaw+nature+photography

 

裏麵還有一個用GND 2當和1當的例子,也是這個山頭。

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