1.I used Neutral Density filter which blocks the light

来源: 大苏州 于 2010-09-13 16:44:36 [] [博客] [旧帖] [给我悄悄话] 阅读数 : 0 (120 bytes)

make exposure longer.

2. you can save my pictures, then you can find speed from the properties

good luck.

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