The Protector HD filter I use for several years, and the scratch resistance and tolerance to dirt are really good. The specimen with 37 mm diameter, however, goes back. The version falls for the small filter unnecessarily thick from, anyway slips and rattles the filter in too big box - a very unsatisfactory solution. Especially in a in a very compact camera (Lumix GM!) Matching filter would be to exchange purposes also want a compact and suitable box.
