100fps to Post question

[Rommel Genciana]

Hello all

We are looking to do a speed ramp from 24fps to 100fps, but being able to time with an action would be very difficult with our current set up, so I am planning to shoot the entire sequence in 100fps 2K RC36 16x9. Does anyone have a correct setting in Final Cut to make 100fps look like 24fps? Also I am having problems deciding what shutter angle/speed to shoot on. Does anyone know what would be the best shutter setting to keep things looking natural in 100fps as well as sped up in Final Cut to 24fps. We are working on a 23.98 Timeline.

Will I have problems with strobing shooting at 100fps? I am primarily using 4x4 Kinos and 1.2 HMI to complement location which is a supermarket which looks to use Daylight (Halogen?) bulbs? I'm not quite sure, as I will be scouting with my gaffer soon.

Any advice, input or guidance would be awesome.

Thanks!

 

[M Most]

Hello all

We are looking to do a speed ramp from 24fps to 100fps, but being able to time with an action would be very difficult with our current set up, so I am planning to shoot the entire sequence in 100fps 2K RC36 16x9. Does anyone have a correct setting in Final Cut to make 100fps look like 24fps? Also I am having problems deciding what shutter angle/speed to shoot on. Does anyone know what would be the best shutter setting to keep things looking natural in 100fps as well as sped up in Final Cut to 24fps. We are working on a 23.98 Timeline.

If you're expecting to do the speed ramp in a program like Final Cut, and need to make it run as if it were shot at 24fps, I would suggest using a multiple of 24, in your case, 96fps (24x4) rather than an odd speed like 100fps. That will let the program essentially play every 4th frame when you speed it up by a factor of 4 and, with a bit of motion blur, give you something that roughly (very roughly) approximates what you would get at 24fps.

 

[Tom Mitchell]

I would recommend that you shoot at 96FPS or 120 so that you get better results when you resample at 24FPS or you will get uneven frame dropping.

the safe shutter angle depends if your on 60hz or 50hz on the HMI

the following stats are for the silent mode (or same for florescent) as flicker free should be prity much safe most of the time. at the higher frame rates i would fire off a quick clip before shooting (or better yet during testing week) and get your DIT to do a quick check.

so for 60hz:
24FPS = safe at any angle
48FPS = 144 and 288 Shutter angle
96FPS = 288 Shutter angle
120FPS safe at any angle.
100FPS = 300 shutter angle

and for 50hz
24FPS = 86.40, 172.80, 259.20, 345.60
48FPS = 172.80, 345.60
96FPS = 345.60
120 = not possible shutter angle
100 = safe at any angle

I got these stats from a industry known program called Pcam which i use a lot. but you can also follow the following link to download a HMI Flicker chart

http :// cinematographyelectronics . com / index_flickerfree . html
(remove the spaces)

hope that helps, good luck and happy shooting

 

[Tom Mitchell]

If you're expecting to do the speed ramp in a program like Final Cut, and need to make it run as if it were shot at 24fps, I would suggest using a multiple of 24, in your case, 96fps (24x4) rather than an odd speed like 100fps. That will let the program essentially play every 4th frame when you speed it up by a factor of 4 and, with a bit of motion blur, give you something that roughly (very roughly) approximates what you would get at 24fps.

yer what he said, sorry your post wasn't there while i was writing mine. so sorry for the repeat on that.

 

[Joe G.]

Well, I haven't done this, so don't blame me. But the guy who shot Terminator Salvation highly recommends the program TWIXTOR.

He said that the results of converting 30P to 24P in Twixtor were better (more film like) than if he had shot 24 in the first place.

Something to definitely look into.