P&S Camera for fluorescence imaging

[ujwals08]

Hello,
I am a researcher working on fluorescence imaging using a Point and Shoot camera. The specifications for the camera are
1. 12 bit RAW images
2. 20 mm working distance
3. Remote shooting and RAW image download over USB

After some research, CHDK seemed to be the solution for remote shooting.
However I am confused about which models can give 12 bit RAW images. Most of the P&S cameras have a minimum focus distance of 3cm, so can I still get images from a distance of 20 mm or do I have to get a macro lens.

Any help/suggestions would be appreciated. Thank you.

[ujwals08]

@kvbarkley Thanks. Does the SX530 camera have global shutter? I could't find the details of that anywhere. 

[smack53]

Point and Shoot cameras don't have an actual shutter, they use a time value for how long the sensor will detect light. That is why Canon calls the shutter priority mode "Tv" on the dial. The shutter sound is there only to let you know a photo was taken.

Steve M.

[kvbarkley]

Except Canon SLR's which do have an actual shutter also use Tv on the mode dial.