Shutter Speed question

capel

capel

Active member
I'm trying to get that chaotic look in 28 days later, where the actiony stuff looks really stroby and there's no motion blur. I cranked my shutter speed up to 1/1000 and the image was basically black.

I had to open everything up completely and even set the gain to High to even be able to see anything. The motion looked great and is pretty close to what I was hoping for, but is there any way to achieve this without cranking the shutter speed so high? Maybe something in post? I'm thinking I'm gonna have a hard time matching this with other shots in the same scene that will be shot in 1/24 or 1/60.

Thanks for any help!
 
Hi Capel,

I find that at 24p, a shutter above 1/60 should do it...I personally never find a need to go above 1/250.

Actually, I am curious to know exactly what you are looking for. Let us know when you find it.


Jason
 
Thanks for the replies. I'll try not going so high, see if that works. But I'm assuming the higher you go the more noticeable the effect will be. Ah well, worth a try. I'll do a test and upload it to show you guys what I'm talking about.

In the meantime there are a few examples in this mock trailer for the movie. Mostly at :43 where he's running up to the camera with a crowbar. It's kind of hard to tell because it's interlaced, but it's that kind of manic, stroby motion that especially shows up in shaky camera movement and fast action.

http://www.youtube.com/watch?v=Kiw-1Kz1gwM

Nexis: So shutter angle is different than shutter speed? How do I change it?
 
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capel said:
Nexis: So shutter angle is different than shutter speed? How do I change it?
Click to expand...

the shutter angle is determined by the shutter speed and frame rate.

e.g. 24 frames per second + 1/48 seconds shutter speed = 180 degree shutter

it's something that has been inherited from motion picture film cameras. part of what makes film look like film, etc.

read more about it:

http://blog.tylerginter.com/?p=385
 
Fahad said:
the shutter angle is determined by the shutter speed and frame rate.
Click to expand...

That is incorrect. In fact, the shutter speed is determined by shutter angle and frame rate.

The formula for shutter speed is: 1/[(360/shutter angle) * frame rate].

So for a shutter angle of x degrees and a frame rate of 24fps the shutter speed is:

where x is =180: 1 / [(360 / 180) * 24], which = 1/48.

where x is = 90: 1 / [(360 / 90) * 24], which = 1/96.

Conclusion: INCREASING SHUTTER ANGLE RESULTS IN A SLOWER SHUTTER SPEED.

-- the foregoing assumes that the camera's shutter setting is set to synchro scan rather than one of the specific shutter speeds that can be selected using the shutter +/- function.
 
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So then I should be able to set it to synchro scan, which is at 180, and know that I have a 1/48 shutter speed pretty much all the time. Yeah?
 
capel said:
So then I should be able to set it to synchro scan, which is at 180, and know that I have a 1/48 shutter speed pretty much all the time. Yeah?
Click to expand...

That's correct, assuming you are filming at 24 fps. If you haven't changed the synchro scan settings you shouldn't have to since 180 degrees is the default.
 
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