Some advanced tips for the 180° shutter rule.

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Hi, I'm Mike from how to shoot and edit - today we show you some advanced tips for the 180° Shutter Rule.
180° Shutter Rule - Advanced Tips
To get the most natural looking footage your shutter speed should be twice the framerate which equals a shutter angle of 180 degree. So theoretically that is pretty easy, right? If you shoot at 24fps your shutter should be 1/48th – for 25fps 1/50th – for 30p 1/60th. Now let’s take it a bit further. The modern cameras are often able to shoot at 50/60fps or even 100/120fps or higher. So why do we use that framerates? Yes, we use them to be able to slow the footage down in post. The keyword here is...we are able to...Often we don't know if we will slow the footage down or we if speedramp it etc. So lets think about it like that...For examle if we shoot in 50fps and follow the rule we have the shutter at 1/100th Now here is what we recommend. If you shoot at 50 fps and you don't know for sure, that you will slow the footage down to 50% - use 1/50th as your shutter speed. Theoreticly you have a shutter angle of 360° But if you are working on a 25p Timeline and dont slow it down, you are skipping every second frame and you have your 180° shutter rule for the real time footage again. When you slow it down to 50% you are using every frame and your effective shutter angle is 360°. But two things...first, your footage isnt supposed to look 100% natural anyways, because it is slow motion. Second 1/50 shutter is in almost every case not too much motion blur to still look good. When you shoot extrem fast movements like action sports, you should fasten your shutter speed a little bit anyways. So what do we recommend when shooting at 120fps. Same thing. We recommend the shutter to be at 1/120th . This is not too much motion blur for slowing it down to 20% on a 24p timeline. When you dont slow it down, it is the best you can do, because 1/120th is the maximum shutter speed when you shoot at 120fps. One more advantage is, that you get better low light footage by maximising the shutte speed at higher framerates, which can be a huge deal when you dont have enough light to work with and want slow motion footage anyways.
So the conclusion is the following: Shoot at the shutter speed, that comes closest to the 180° rule, when using the footage in real time to get the most natural looking footage using it in realtime. In almost every case the result still looks good, when you slow it down in post
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