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The Polar Pro "Frame" Glass Neutral Density Filter slides directly over the lens of the Naked GoPro HERO3, HERO3+, or HERO4 and can be used alongside the Frame Mount. It reduces exposure by 3 stops, allowing you to shoot bright scenes at slower shutter speeds. A slower shutter speed allows fast-moving objects to retain a more natural-looking motion blur and can help reduce the apparent effects of vibration when mounting the GoPro HERO to an RC helicopter or vehicle.
The "Frame" Glass Neutral Density Filter features a scratch-resistant microfiber pouch that you can store the filter in.