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Old 09-24-2014, 11:55 AM
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CLODO CLODO is offline
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Join Date: Aug 2008
Location: I live in Pessac, city surburb of Bordeaux - France
Posts: 1,864
Arrow ND variable grad filter

see some advice on this previous forum:
http://www.trekearth.com/forums/showthread.php?t=841799
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