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The B+W filters are very good - but expensive. All my filters are B+W - polarisers, neutral density etc.
For the 486 and 489, one is a clear filter with interference layers and looks really great on the front of a lens - the reflection of the coating looks really sexy. But I found it doesn't work well on lenses less than about 20 mm focal length due to the angle at which the light comes in - you get weird colours. The other filter is pale green like the CC1. Apart from the less than 20 mm problem, the actual results are pretty much the same.
From the Madsens website, you can download a pdf manual about the filters.
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