Has anyone noticed a problem with motion lag while looking though the LCD in movie mode on the 5DMkIII? It's really noticeable when you wave your hand in front of the lens and the image in the LCD lags behind. And this is not a little bit of lag, it's enough to prevent me from shooting any kind of action. I did a Google search and it has been mentioned by a few people and it's a problem in some of 1st batch of cameras. When I called Canon Service, the rep said she had never heard of the problem but I should send it in for them to look at. So I sent it and asked them to address the light leak issue through the top display window while they were at it. I got the camera back this afternoon and the service receipt indicated that they fixed the light leak but there was no mention of any work done for the motion lag. When I fired the camera up and put it in movie mode, the lag was still there. I'm going to give them another call in the morning but I'm wondering if this has been a problem anyone else has experienced.
Personally if I am shooting live video I never rely on the LCD, watch the scene itself, not the LCD so much.
What you are seeing is probably normal, unless there was a hardware change early on, the only difference would be firmware which you can update to the latest version.
There could be many factors here, when you start to shoot video, the camera may be limited to sampling the sensor at the framerate of the video (30fps or 60fps), whereas the ordinary live view framerate might be higher than that. Or you might be restricting the frame rate depending on how you have video set up, like if you are following the 180r thing for video, that is shooting 24fps video at 1/50 or 30fps video at 1/60.
It might also also be encoding lag, it's hard for me to judge myself but there might be a slight difference in lag between the normal "high compression" modes (IPB) and the all-I modes.
I actually noticed it first when I had it attached to a 7" monitor. It happens in all movie modes so it has nothing to do with the compression. It probably has something to do with the hardware in the first version.
Update: I just checked out two camera, one being at Samy's Camera, and they both exhibit the same behavior. Looks like it's something I'll have to live with.
To me the lag is noticeable even in live view, but every camera I've used is like that. When I was making stuff that required following action accurately, I used a digital camera with an optical viewfinder. If I had to do that today, I'd probably use a red dot sight on the camera or something other kind of homemade optical sight.
