Correct Shutter speed for 60fps? 120fps and 240fps

[Gene Sung]

I'm on an FS700 and we have a project we are mostly going to shoot in 1080 60p.

I noticed that when set to 60p, the nearest shutter speed to the the 180 degree rule is 125. I wonder why there is no 120? Will I get a flicker with the shutter speed at 125 using lights since I live in the USA, a 60hz country?

Is that the correct shutter speed I should use for 1080 60p? 125?

For 120 fps should I set the shutter speed to 240?

And at 240 fps, does the shutter speed need to be at 480?

Does the 180 degree rule really apply anymore since we are on digital?

Thanks for any info

 

[eheath]

180 degree rule is only really needed if you want film like motion blur. You wont get a flicker because 60p is 60hz. now, if you shoot 50p in USA, you'll get a flicker and vise versa.

 

[Demistate]

I really hate footage shot at "Open Shutter" or a shutter speed that matches the frame rate. It really screams VIDEO! As long as your shutter speed is twice the framerate you are recording at, it will look smooth and crisp. In super slow motion don't be afraid to go even higher than that since slow motion should have everything frozen in time for each frame.

 

[hammerhorror]

When I shoot slow motion footage (120, 240, or 480fps) I use the highest shutter speed I can get away with. The whole point of slow motion is to see the action in crisp detail.

As far as shooting at 1080/60p, I would set your shutter speed to 125.

 

[jshbckr]

When I shoot slow motion footage (120, 240, or 480fps) I use the highest shutter speed I can get away with. The whole point of slow motion is to see the action in crisp detail.

As far as shooting at 1080/60p, I would set your shutter speed to 125.

Agreed. A while back I did some tests with different shutter speeds at higher frame rates and I also prefer the sharpness of using a higher shutter speed than "recommended."

 

[tim davison]

Presumably when you refer to "using higher shutter speeds" these are always a multiple (i.e. at 240 use 500, 1000, 1500 etc?)

 

[Bruce Watson]

I'm on an FS700 and we have a project we are mostly going to shoot in 1080 60p.

I noticed that when set to 60p, the nearest shutter speed to the the 180 degree rule is 125. I wonder why there is no 120?

Easy -- it's because "we've always done it that way". This is right off the shutter speed dials of still cameras. Silly on a video camera, but there it is.

Will I get a flicker with the shutter speed at 125 using lights since I live in the USA, a 60hz country?

Depends on the lighting. If you're shooting under magnetic ballast fluorescents, then yes, you'll get some artifacts. But at this speed you'd probably get some (but fewer) artifacts at 1/120th too. If you're shooting under electronic ballast fluorescents that run in the 30+ kHz range, then probably no artifacting at either shutter speed. But the moral of the story is, of course, test, test, test. Why guess when you can know?