Here are some common overcranked frame rates with the respective percentages they should be slowed down to in post (in a 24p project/timeline): The 48fps example is an easy one, since it’s exactly double that of 24fps. The point of all this, is that it’s very important to know the exact percentage you need to slow your footage down in post in order to maintain that 180 degree shutter. This would give your footage that fast-frame look I described earlier and clearly wouldn’t adhere to the 180 degree shutter rule. But if you didn’t slow that clip down at all, and just dropped it into a 24fps timeline, you’d essentially be working with a 24p equivalent shot that has a 1/96 shutter speed instead of 1/48. In post, if you were to slow that clip down to 50%, you’d end up with a perfect slow-motion effect since it would effectively play back at 24fps with a 1/48 shutter. Let’s assume you’ve captured a 48fps clip at a 1/96 shutter speed. But in the editing room, things can often get confusing for filmmakers… If you’ve been shooting for a while, then this may be second nature to you. If your shutter speed is any higher or any lower, you’ll get unwanted results - either a sharp “fast-frame effect” or a slow-motion blur. So if you’re shooting at 24p, you’ll want your shutter speed to be set to 1/48. The 180 degree shutter rule states that your shutter speed needs to be double that of your frame rate. But if you don’t follow the right formula in the editing room, your results will be less than ideal.
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