The Heliopan Slim High Transmission Circular Polarizer SH-PMC Filter integrates advanced High-Transmission technology, allowing 99.8% of light to pass with just a 1-stop reduction, maintaining true color fidelity. Featuring Heliopan’s SH-PMC 16-layer multi-coating—eight layers on each side—this filter enhances durability while minimizing flare, dust, and moisture intrusion. Optimized for auto-focus SLR cameras, it also performs well with manual systems. Its high-transmission design results in a lower filter factor of 2.0, compared to 2.5 for standard polarizers, providing effective polarization with less light loss. Maximum polarization effect occurs at a 90-degree angle to the sun..