D600 dust - fixed??

I once made the mistake of using a 60mm Micro at f/45 to shoot a dust test shot of a clear patch of sky. For good measure I had focus set at closest point. I had a number of spots that would not clean off. Turned out, it was very fine dust on the lens. Now I use f/16.

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Robin Casady
http://www.robincasady.com/Photo/index.html