The remarks of my Vorrezensenten is not much to add. Technically processing makes the Hama Polarizing Filter, except for the screwed-in swivel adjustment pin, a good impression. I have these unscrewed immediately after purchase and hab 'since no more problems with it. The filter can also turn good without him. The picture quality is excellent in my opinion. The polarizing filter does exactly what it should. He avoids reflections and reinforced at very sunny days the contrast. A supposedly higher quality compared piece does not bring better results on my lenses.
I give him therefore the 5 star fully. The small defect with the adjusting pin is of no consequence to me.
Supplement 8/2011: I use the filter in the 46mm reviewed here now on my Sigma DP1x. In connection with the HA-11, it can be used in Sigma. But also because of the adjusting pin has to be removed, although the scattered light portion is attached to the Sigma next to the tube. This combination (DP1x + filter) brings about very horny pictures.
