convincing slow-motion

B

bgdnoble

New member
Im going to be working with a Canon 5d and I'm wondering if using Final cut express has the power to provide a convincing slow-motion. At this stage I am very green with all forms of production, so I'm not really even sure if there are other ways of doing slow motion. All I know is just slowing the video in post. Are there any other ways to go about slow motion? I tried slow motion on a panasonic SDR-H60P quality shot and it looked retarded, but with a 5d it should be 100x better right? haha well I'd love to hear what you guys think so have at it.
 
Twixtor is much better than FCP/FCE. Best way to get slow motion is to overcrank, that is, shoot at a faster frame rate than playback. 60p to 24p is pretty standard. Some cams will do 120 fps and higher. As for the 5d, I don't know of any way to overcrank.


Jason
 
thanks for your response, do most cameras have an option to change the frame rate? is that shutter speed?
 
Many cameras these days do have an option for over or under cranking. Some still do not. This is different than shutter speed. The shutter is simply the exposure time for a frame.
 
I was always told the the faster the shutter speed, the better the slow-mo..? This was in the days of no over-cranking...

Is it advisable to shoot at say 1/1000th if there is enough light to achieve a slightly crisper slow-mo?
 
IT's been my understanding and experience that as long as you follow the 180 degree shutter rule and overcrank, you'll get some truely great slow motion.

60p w/ 1/120 shutter played back at 24fps provides frame accurate 40% slow motion.
 
180* is different from the fraction of time system.

IE:

24 fps at 180* is every frame being exposed for half of 24fps... meaning 1/48th of a second per frame.

48fps at 180* is every frame being exposed for half the time of 48 frames per second... meaning 1/96th of a second.

Even if you keep the shutter open at 360* shooting at 48fps will have the same exposure time as 24fps at 180* shutter.

Hence if you are shooting 1,000fps, your shutter... at the absolute most open can only be 1/1000th of a second exposures.

I usually follow the 180* rule for anything over 24fps to around 100fps.... above that, I go open on the shutter because the fps forces a fast shutter anyway.
 
I find that if the shutter is too high - like 1/1000 when shoot at 60p and conforming to 24p, the slow motion looks too crisp. For me, a little motion blur is a good thing. I tend to follow Ryan's philosophy.


Jason
 
You can also try running the MSU frame rate converter . Very precise and you run it using a simple Avisynth script and VirtualDub. Gotten very good results from it and from tests it seems to outperform the commercial competitors.
 
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