The brush side is useless to me, not only this side is not closed so gathering dust, prime the brush loses its hair, so in terms of dusting the objective, I let you deduce the result. Nothing like a pear bought almost nothing in pharmacy. By cons, carbon side is very efficient, no complaints, I had pool water marks, fingerprints, in short, a very dirty goal, and he returned nickel. And despite the small size of lenspen, I did not put more than a minute to clean this 72mm diameter lens.
