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Shutter speed/lighting Hz
I got asked to film a Big Band gig on saturday night and it was my first time out since the firmware upgrade. I set things up as Jon mentioned a few threads ago, - Shutter at 60 aperture and something decent for the light level and a reasonable ISO setting too.
While setting up I noticed the picture was flickering at shutter speed of 60 but went away at 50. Do I have it right that that is because the lights at 50Hz clash with the shutter speed here in PAL land? And that I should stick to shutter 50 from now on? I shot the gig at 50 by the way, and no problems, just wanted clarification here guys, Cheers Avey |
Yeah, in 50 Hz land, shooting 1/50 in artificial light is the way to go. Outdoors, you can shoot at any shutter you want. I'm glad you didn't stick with 1/60... "But Jon said..."
I hope the footage (bytage?) turned out great! |
The problem is that the frame rate is out of sync with the lighting power. Slower shutter speeds help, but I'm surprised that 1/50s removed all flicker because the frame rate is still 30fps and the power line frequency is still 50Hz. Still, if it worked then that's great.
Richard |
sorry if this is a dumb question... but what use is the PAL/NTSC setting on the camera, when the only option is to shoot at 30fps? (and also forgive me if this is the wrong thread to post this - just been bugging me for a while...) I'm in PAL land.
thanks |
Thanks for your helps guys.
And you know, I always do what Jon says… Apparently, he's the boss of me. |
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There area couple of clips on Vimeo that demonstrate this nicely. EOS 5D mark II manual shutter test with 50Hz lights on Vimeo 5Dmk2 tests with 50Hz lights part 2 on Vimeo |
Thanks Nigel, these were well handy clips
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The worst type of lighting I have seen for causing this problem is the fluorescent lights you commonly get in shop windows. These even cause problems when shooting street scenes in the daytime. It would be good to see a test done with these lights using different shutter speeds to see if 1/50s works ok. Richard |
Any remedy for flickering footage?
Hi folks!
We've shot our first day of a feature with three MKii's and have made the mistake of filming some of it under fluorescent lights. The scenes are rather difficult to re-shoot (kids), so: does anyone know of a software solution to remove the flicker from the footage? Thanks! Dan. 1st AD and a lot besides on ˇPrimaria! ¡PRIMARIA! |
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If the FPS is an integer divider of the flicker rate the brightness will not flicker fast in the video, BUT, it will vary slowly over time because the frame rate doesn't exactly match the flicker rate and their sync will drift. However, making the shutter speed an integer divider also works and it doesn't have the slowly varying problem. That is because the exposure time covers one part of the sine wave and as the phase of the two drift, the sum of the sine wave stays constant. So use shutter time to fix flicker, not FPS. Correction: I shouldn't have said integer divider. The values are 1/2, 1, 2, 3, etc. times the fast flicker rate. |
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Now, go out and make a great film. Sincerely, - Your Boss :) |
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Richard |
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Actually. Just got back from Canada yesterday where we shot a nice music video on the 5D2. Looking at editing it over the next week or so. Will keep you all posted..Avey |
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