I agree with theonecanoe


     I agree with theonecanoe in that a good ND filter will help lower the light that hits your sensor, if you can use them with your camera.  However, you need to look at your shutter speed.  Usually, your shutter speed should be 1/(2 x your frame rate).  So, if you're shooting at 24 FPS, you should keep your shutter speed as close to 1/48 or 48 as your camera will allow.

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