- Brass Ring for higher Quality Image
- Highest possible polishiing technique
- World's best optical glass
- New thinner Pro mount. No vignetting
- USA Warranty
This B+W Circular Polarizer filter is specially designed to be used with auto-exposure and auto-focus SLR and video cameras. It does not influence the metering systems of these cameras. Filter factor is 2.3 to 2.8.