Shutter angle for filming a tv at 25fps
Posted 24 January 2007 - 07:32 PM
Thanks a lot!
Posted 24 January 2007 - 08:17 PM
These factors will all affect your options and your needs in terms of sync boxes etc.
Edited by Daniel Christie, 24 January 2007 - 08:19 PM.
Posted 24 January 2007 - 09:57 PM
Posted 25 January 2007 - 02:20 AM
You do realize that even shooting a 60i monitor at 24 fps with a 144 degree shutter does not eliminate roll bars, only makes them thin lines instead of thick bands. They still roll unless you shoot at 23.976 fps, and even then, you can't get them out of the picture, so you end up with this thin line in the image.
In theory, a 150 degree shutter at 25 fps will give you a 1/60th shutter speed, just as a 144 degree shutter at 24 fps will. So you'd use a 150 degree shutter when filming an NTSC monitor at 25 fps to make the roll bars thinner. But they would still drift.
Posted 25 January 2007 - 11:20 AM
I will be shooting a 60i NTSC monitor (cathodic screen) at 25 fps, I am shooting for PAL but in Canada. I asked for a synchronisator to be added to my camera list but will it solve the problem entirely?
While I am at it, I also heard that plasma screens don't have the pulsation when you film them at 24fps 180 degrees, is that correct?
Posted 25 January 2007 - 11:29 AM
LCD screens don't flicker/pulse. Plasma screens might pulse but if you shoot at the same Hz speed, then it probably will be OK. So I'd see if a 150 degree shutter at 25 fps would get rid of the 60 Hz pulse in a Plasma screen that is showing NTSC.
Posted 25 January 2007 - 12:39 PM