The shutter speed setting also affects the amount of light that the CCD has got time to absorb, so the higher settings will make the video dark. If you are outside in bright weather 1/250 is a good starting point, indoors you will probably not be able to get over 1/100.

Use it in conjunction with the Iris/Exposure settings and see what works best for your cam.

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Edius Pro 4 Broadcast, Edius DVX, ADVC300 -- PremPro 2.0, Matrox RT X100