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Author Message   Ivanku Tinkerer Username: Ivanku Post Number: 4 Registered: 03-2012 Rating: N/A Votes: 0 Posted on Saturday, March 31, 2012 - 10:52 pm:    Hi Rick, Thank for your post. I have just opened the front retaining ring (still don't know how to open then name ring. Good, I could take out the front piece of lens and cleaned it. Anyway the lens is clean dand clear now.