Taking stills is a completely different way of working than taking video. Having a overly crisp image isn't necessarily good for video. You want to the movement to look natural. Like I said, if you're shutter is too fast, you start to get jello with these CMOS sensors. You want a little smear in the image to keep it natural. These are basic rules of video. Yes one can break the rules if you know what you're doing and desire the effect. Like in the beginning of the movie Saving Private Ryan, they use a fast shutter speed to make the video look jittery, which enhances the emotion of storming a beach when you're filled with adrenalin. But generally speaking, the 180 rule is that you keep your shutter at twice your frame-rate. But go ahead and do some tests. Shoot video with no filter, and a 1/8000 shutter speed. See if you like the result.
