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. We make 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. They are both available in Shop By Parts.
3. You can purchase a Outex Dome port (both/either size would work), then use an Outex Dome clamp to fit/match the lens' diameter size. In other words, since the lens filter thread is taken/ocupied by the polarizer or ND filter, you'd clamp the Outex clamp on the perimeter of your lens. Both/either Dome Kits include a clamp (or adaptor). See example image below using an ND filter inside of a Dome.
4. 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 firstname.lastname@example.org or (818) 583-7731.
Professional cinematographer Mathew Sutherland used ND filters and polarizers in the making of this short film for Panasonic/Lumix for the launch of their GH5 Mark II camera. You can see many other examples on our Community pages, such as the Blog, News, Reviews, and Social Media Channels like YouTube, Instagram @realOutex, Facebook #Outex, etc.