August 6, 2020 at 4:43AM
180 rule for Slo-Mo?
I think I've just had one of those flashbulbs moments of realisation.
I have been shooting at 60fps and then normalising it in FCPX to 24fps using 'Automatic Speed'
Most of the time it looks OK, but if I get much lateral movement then it starts to look a bit jerky.
The flashbulb moment is that I think I should be setting the shutter speed using the 180 rule for the project frame rate NOT the shooting frame rate.
I.e. I have been shooting at 1/125s at 60fps and then slowing it to 24fps. But the original frame is still shot at 1/125s, it doesn't automatically introduce that Motion Blur that we all love so much, hence the jerkiness in the lateral movement.
So, even though I am shooting 60fps, because I am intending to slow it down, I should be aiming for the 180 degrees of the 24fps project frame rate which would be 1/48s.
Not really possible, but 1/60s at 60fps is.
Did that today and it looks a lot better, still not perfect but I suspect that I'm now in the zone of pixel peeking so I need to back off and come back to this.
Anyone have any thoughts or is this just one of those blindingly obvious "D'Oh!" moments for me.