camera recommendations?

[Rebecca Lundwall]

I am trying to get a new research lab set up. I use EPrime to present 
stimuli and a camera to collect eye movement data. I am working with the 
college's computer services and they asked me to contact this group and see 
if you had recommendations on *camera specs* for the following situation. 
PSTNET support also suggested that I ask this question here. I do not use 
eye-tracking equipment because it does not work well with young infants. 

My question is if anyone knows of a camera or camera set-up that would work 
without the ForA timer. My key concern is having a time-stamp on the video 
and that the time-stamp is controlled (started and stopped) by EPrime 
presenting the stimulus. I will describe how we have done this in the past, 
but I can no longer find a supported For-A video timer VTG-33 (which 
reports frames) and we are nervous about buying the one I found on Ebay. 

In the experiment:
1) E-Prime simultaneously sends an image to a monitor and starts the ForA 
timer (or it could start the camera's timer)
2) The ForA timer (if used) puts a time stamp on the digital video 
recording. The timestamp starts and runs until EPrime tells it to stop. 
Stopping the clock is important so that trials are separated and RAs don't 
get confused when they go back and code for eye movement latency and 
direction (left or right). If I used the camera's internal clock, EPrime 
would need to start and stop it's clock or start and stop the entire camera.
3) the digital video with the time stamp are sent back for storage on the 
computer
4) the digital files are opened  with a video editing software) that can 
detect scenes based on lighting conditions (the presentation of a new 
stimulus triggers a new scene); we number the scenes and two RAs code them 
for eye movement latency and direction. 

So, does anyone know of a camera that has a timestamp down to the frame 
level and that can be synced with the presentation of a stimuli by EPrime? 
Other info or related questions: 
*the camera must work in low-light conditions
*there are approximately 50-60 trials for infants and 200 for children, 
each is presented for between 67 msec - 4 sec 
*I care about response differences as small as 10-20 msec (so am thinking 
about a camera with 60 fps or more)
*is 60 Hz sufficient for the CPU?  If I get more fps on the camera do I 
need higher refresh rate as well?
 
Thanks for your help.

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