These filters fit my Leica Q2 like a glove. They screw on very easily and then hold extremely securely until they are just as easily removed again. The filter is quite thin, so there is no vignetting even with the Q2's wide-angle lens. The filter strengths were selected for practical purposes and are suitable for everyday use. They range from a slight vignetting of 8, through 64, to an almost opaque 1000 strength, which is great for freezing movement while maintaining a large aperture. The glass of all filters is absolutely perfectly crafted. There are no inclusions or uneven coating. The coated surface is also supposed to repel dirt and moisture. I can't really confirm that. In any case, the glass doesn't behave much differently than an uncoated filter. This isn't a negative, as dirt and water roll off equally well in both versions. In addition to the filters, there is a practical little bag and four cleaning cloths for cleaning the lens and filters. Last but not least, the price is also attractive, so I can give the overall package full marks. Five stars and an unconditional recommendation!