Is there a synchro scan on the GH1?

I

Indyreel

Well-known member
I used the hvx200 and know it has a synchro scan for a tv or computer monitor playing in the background, to prevent it's screen from "scrolling".

Does the GH1 have this feature, as I'm filming a scene with an active HDTV in back of the actor?
 
I haven't experienced this problem, or I haven't looked close enough, with my LCDs. Is this still a problem with LCDs? It is definitely a problem for old CRT's that refreshed at ~60Hz. I would guess that fluorescent back-lit LCD's might flicker/band for the same reason that you can get banding under flourescent lighting, but with the amount of light an LCD display puts out is this even something you need to worry about?
 
holdingpattern said:
I haven't experienced this problem, or I haven't looked close enough, with my LCDs. Is this still a problem with LCDs? It is definitely a problem for old CRT's that refreshed at ~60Hz. I would guess that fluorescent back-lit LCD's might flicker/band for the same reason that you can get banding under flourescent lighting, but with the amount of light an LCD display puts out is this even something you need to worry about?
Click to expand...

For the record, I got home turned on the camera and filmed my 720p LCD TV, 4 year old thinkpad fluorescent backlit laptop monitor, and the relatively new LED backlit Macbook Pro. I didn't see any strobing, scrolling, or banding on the TV or thinkpad. I did see, rather unexpectedly slight "scrolling" on the Macbook pro. The scrolling was the least noticable at 40 and 80Hz framerates, definitely noticable at 30 or 60Hz, and rather objectionable above 200Hz. I am in the U.S. with 60Hz power, although the laptop runs of DC current from its battery.

I didn't think LEDs would have this problem. With LED lighting getting more common, perhaps this is one more thing to keep in mind when analyse the lightiing in a scene. Does anyone know what kind of lighting characteristics LED lights have on a rolling shutter and how to predict and counteract them?

P.S. On a side note I did get nasty moire if I got close enough that the camera resolved the individual pixels on all of the monitors.
 
You must log in or register to reply here.
Back
Top