This is the one I used.
http://www.amazon.com/3-0-1000x-Neutral-Density-Filter/dp/B0012LO1UG/ref=sr_1_3?ie=UTF8&s=electronics&qid=1279729338&sr=8-3
所有跟帖:
•
非常感谢!这下学习也有具体方向了。要学得太多了。
-再学步-
♂
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07/21/2010 postreply
09:35:48