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Heliopan's best coating is slightly better than B+W's, I gather, but probably more important is the fact that Heliopan filters come standard in thin rings now, which are good for wide lenses. Also B+W identifies the filter on the retaining ring, visible from the front of the filter, which is handy if you like filter wallets, while Heliopan engraves the filter type on the side of the ring, which is better if you like stacking caps.
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