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To: dashugao 你曾经说:谢了。
GND就是偏振镜
Graduated Neutral Density
http://www.amazon.com/s/ref=nb_sb_ss_i_0_32?url=search-alias%3Delectronics&field-keywords=graduated+neutral+density+filter&sprefix=graduated+neutral+density+filter
To: 燕燕 你曾经说:GND就是偏振镜
请问什么是GND滤镜