There are several options for using polarizers or filters.
1. Keep the cover "open" in front with your filter instead of the Outex front port for water-resistant/above water use (rain, mist, sand, mud, dirt, etc.).
2. There are flat front ports (below 77mm) that offer external threads (77mm) for filters or polarizers on the outside for a waterproof solution (even underwater). For thread sizes above 77mm we sell an extension for a 95mm external thread so you can use 95mm polarizers or filters.
3. Or you can use them inside the housing if you're looking for waterproofed protection, but with limited access if it's a variable filter.
You can shop for External Thread Front Ports in Shop By Parts
If you still have questions or need help contact our tech support team at email@example.com or (818) 583-7731.