[MacDV] Re: flicker rate & stabilizer

[James Asherman]

On Saturday, January 10, 2004, at 06:33  PM, Colin McDonald wrote:

>
> On Saturday, Jan 10, 2004, at 19:11 Europe/London, Mark M. Florida 
> wrote:
>
>> On Jan 10, 2004, at 1:01 PM, Brett Koonce wrote:
>>
>>> It's an old film trick, synching gates.  Nowadays, there's an easier 
>>> trick: just find a LCD monitor to film.
>>
>> Or use 60 Hz -- not very good to look at first-hand, but should 
>> transfer well to video (NTSC, right?).  If your shooting PAL, maybe 
>> 75 Hz?  Or you could adjust the frame rate of your camera to as close 
>> of an even multiple of your scan rate as possible -- like set your 
>> computer to 60 Hz and your camera to 1/30 sec.

85 and 15 to go the other way.

>
> I remember watching a television shoot in a set with a prominent 
> computer monitor. The camera operators synced their cameras together 
> and then varied the sync signal a wee bit up and down until the 
> flicker and lines disappeared from the image of the monitor.
>
> Just because the frame rate equalled the flicker rate (unlikely 
> anyway) would not necessarily give a clean image - you might just as 
> easily get a fixed black line or other lines.  There's more to it that 
> that.
>
> There must be someone on the list with studio experience of this kind 
> of issue.
>
> Colin McDonald
>
>

You want to run the monitor at 60hz and genlock it to the camera or 
vica versa.
  That not being practical, I say, up the monitor rate and lower the 
camera frame rate, till it stabilizes.
J  (Untrimmed)