B+W 1101634 77mm Master CPL Polarizer MRC Nano

The B+W 77mm Master High Transmission Kaesemann Circular Polarizer represents the top tier of B+W's filter lineup, built for photographers who demand the highest optical performance from every element in their imaging chain. The Kaesemann construction seals the polarizing film between precision-ground glass layers, preventing moisture intrusion that can cause uneven polarization and color shifts over time — a common failure mode in less expensive polarizers. The result is a filter that maintains consistent, reliable performance across years of use in demanding conditions.

The MRC Nano coating is applied to both surfaces and serves a dual purpose: optically, it minimizes flare and ghosting to preserve contrast and color saturation; practically, it creates a surface so smooth that water beads and rolls off, and fingerprints wipe away with minimal effort. The black knurled thin-profile mount provides a secure grip for rotation adjustments and keeps the overall stack height low enough to avoid vignetting on full-frame lenses down to 17mm. With a polarization factor of 2 to 3 — roughly 1 to 1.5 stops — light loss is kept within the expected range for a high-quality CPL, and the included QR code authentication gives buyers confidence they are getting a genuine B+W product.