Best way for slow motion

[rtf]

I have a videoshoot with a model coming up soon so hopefully someone will reply.

All the shots will be filmed in 50fps and i want it slowed down to 50% to give it a "dreamy" feeling. Can I achieve this by putting the 50fps footage in a 24fps timeline? What is the best way to get a little slow motion ? I am using After Effects btw.

Second question: when filming with 50fps or 60fps in tungsten light it gives flickering. I will shoot a lot under tungsten light so how can I use slow motion without flickering? A low shutter speed perhaps?

Thanks!

[ItsMeLenny]

The slower you want the motion, the higher you want the recording frame rate.

How you slow it down depends on your video editing software.

To avoid flicker you need to calculate the hz of the light with the frame rate to find what the shutter speed should be to avoid flicker.

Also, here is a program for doing "twixtor" like slow motion http://slowmovideo.granjow.net/

[rtf]

Thanks for the fast reply.

It's not possible to use 60fps on the 550D with Magic Lantern unfortunatly: it will give  me only 1 second to record in 1280x334, which is too short. That's why I will use 50fps so it will give 3 seconds of footage.

I know twixtor but the results aren't always that great (ghosting).

[edit] Oh, it isn't twixtor I see, i'll check it out, thanks.

[DeafEyeJedi]

You can also use the shutter fine tune module in the ML setting...

Works well to avoid flicker in high FPS on my 5D3.

Not sure about the 550D.

[anarchyjim]

You can also remove the flicker in post production. We develop  a plugin called Flicker Free for that purpose:

http://digitalanarchy.com/Flicker/main.html

That said, I'd be a little surprised if you saw much flicker at 50fps. It's really not that slow. Have you done any tests that show flicker? The more severe problems show up when you're shooting 120, 240 or higher since the camera is recording faster than the electricity cycles and picks up the variation in brightness the electric cycles causes in the lights.

Also, make sure your shutter speed is 1/20, 1/30 or 1/60 otherwise you run the risk of having the camera out of sync with the hz of the lights. (assuming you're in the US) An exhaustive (and somewhat dense) article explaining that is here:

http://provideocoalition.com/aadams/story/rolling_shutter_and_flickering_hmis/

cheers,
Jim Tierney