I help manage a small usability lab. One of the things we're trying to is to record paper prototyping sessions - with a user sitting at a table and a camera directly overhead (from a height of about 1.5m) recording what they're doing. However, we've had a lot of difficulty finding cameras and AV equipment that can do this with enough resolution to be satisfactory. We typically use CCTV cameras in the lab (around AUD$100-300 each) - these are perfectly fine for most recording, but when we try to record paper on a table it's impossible to read what the user is writing or see what they're doing in fine detail.
We've tried a number of high-resolution CCTV cameras (e.g. this 1080p camera) and different lenses (e.g. this 3.5mm-8.0mm lens and this 6.0mm-15mm lens), but the best we can achieve is something like this, where even reasonably large text written in black marker pen is barely legible. We've connected the camera directly to a screen and a projector and have confirmed it's the camera that's the issue, not any of the AV gear we use like mixers etc.
Even an iPhone camera from the same height seems to be able to do this job adequately, but we can't find a dedicated camera to match the quality. (And we can't use an iPhone camera for this - aside from the impracticality, we also need to be able to push the video output through the lab's AV system for mixing, recording, archiving etc).
Is there any good type of camera with a BNC connector that anyone can recommend for paper prototyping?