synchro scan and tv monitors

I

inefficiencybad

Member
Hi! I'm shooting a music video with the SDX900 and Pro35 next week and am shooting at a giant wall of CRT TVs. Is there a way I can cancel the roll bar with synchro scan just as a film camera can do with a shutter angle (a la CP16)? If anyone has any experience or knowledge, I'd greatly appreciate it!
 
Sure can. You can use it to stop the roll on TVs, computer CRTs, flickering fluorescent lighting, etc. Depending on the "frequency" you end up having to dial in, it could make lighting more of a chore, but not horrendously so. Probably just adding a little more light would do it (assuming you wind up having to speed up the shutter).
 
Thanks for the response! I tried dialing in all settings to get rid of a scroll bar but couldn't find the right setting. Any you recommend? Assuming US electricity is a standard for frequency, it should be easy. I've done a lot of this with shutter angles in film cameras. Any suggested shutter speeds you recommend?
 
No idea. 1/525th might do it. (NTSC is 525 lines, yes?)

Or would it be half that? 2 scans per second? But either way, that's going to seriously screw with your lighting.

Computer CRTs are much easiest to work with. And some of them you can dial in to match the camera, at least, instead of the other way around. :)
 
Thinking some more about it... Did you try around 30? (29.97, perhaps...) TVs may be 525 lines, but they do 2 scans per second (more or less), which brings it in around 30.
 
OK. Instead of theorizing, I just whipped out the camera and pointed it at the TV.

1/60th of a second shutter. No lines, bands, or flicker. That's on an NTSC TV.

If that's not working for you, there must be something else going on....
 
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