stringtheorist,
After reading your other thread where you say you would like to make "professional quality videos", I would suggest you reconsider your idea of using webcams. I misunderstood your earlier posts, I thought you already had one decent video camera and were looking at the iSight as a second camera. While webcams have gotten better over the years, they are still far away from good camcorders.
Some of the differences that will impact your quality are:
- The optical components (lense and image sensor) are going to be dirt cheap in a webcam, and the image quality reflects that.
- Lack of controls: As far as I know, if a webcam has autofocus, it's considered high-end. So there's no way to control zoom, exposure, white balance, etc. before the light hits the image sensor. Any correction happens electronically at a later stage. Not good for the image quality.
- I would expect that you'll have to live with reduced color accuracy.
- My guess is that you'll have a harder time positioning your webcam, compared with camcorders that you can mount on a tripod.
If you can borrow or rent a couple of good camcorders for your recording, I think you won't regret doing it. If you are stuck with webcams, then it'll still be possible to make videos that have instructional value, but I believe your goal of producing "professional quality videos" is unrealistic.
- Martin