B+W XS-Pro MRC Nano £140, $175
for 77mm fitting
Like Hoya, B+W offers upmarket and premium options of circular polarisers. However, the physical differences are more noticeable, while there’s less difference in price. The more basic B+W F-Pro MRC costs about £110/ $145, has a standard range of multi-coatings and a thick profile. This XS-Pro ‘Nano’ edition features uprated coatings which are extremely anti-reflective, hard-wearing, water- and dirt-repellent and easy to clean. The low-profile design is also much thinner, being even more slim than in the Hoya filters. High-quality Schott glass is encompassed by a brass frame that has a matte black finish.
While the ultra-thin profile makes vignetting unlikely, the adjustment ring is a bit tricky to operate. The B+W also adds a slightly warm colour shift.