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“Compatible” describes whether it works. “Required” or “Useful” describes whether you should buy it.
PolarPro
PolarPro specifies that these filters mount to GoPro Protective Housing and work with any GoPro camera installed inside it.
Requires GoPro Protective Housing; the filters do not attach directly to a bare camera.
PolarPro
PolarPro's shutter filters fit the HERO9-generation front-lens system.
Open the evidence, limitations, and model identity for a single accessory.