intel made a 300x 'camera' (wanna be microscope) that does a good job for such a thing. search for 'intel play', they shut it down a few years ago, but I found two news ones for like $30. I think it's a 'qx3'.
if you need further info I'll check when I get home, I may still have the box.
it is a toy, not a pro-unit.

more info: http://support.intel.com/support/intelplay/qx3/