The B+W 311 Snap-Cap Pro is a lens cap with two spring-loaded plastic claws that click into the filter thread. This ensures that the cover sits firmly and securely without any time-consuming screwing and unscrewing. The claws can be operated from the side as well as from above. The cap can therefore be fitted and removed through a lens hood, as long its barrel is not too long.
For more than 90 years, B+W filters have been synonymous with quality and innovation. B+W has succeeded in establishing itself as one of the world‘s leading filter manufacturers. It has, for example, made decisive progress in surface coating. B+W is the first filter manufacturer in the world to offer MRC (Multi Resistant Coating). MRC nano coating is the most innovative development in thin-layer technology. The world-famous Käsemann type polarizing filter with its outstanding quality has been produced by B+W since 1989.