The 49 mm filter set of M & L Mobiles offers perfectly adequate, even excellent quality, as one would otherwise expect only in far higher-priced products for my semi-professional needs. Since I use the in conjunction with a Panasonic 3-chip video camera (HC-X929) and use outside when the sun still camera attached additional lens hood. Only with strong wide angle enters slight vignetting, but this has of course nothing to do with the quality of these filters, but is due to physical reasons.
