I have a particular need, and I am hoping the experts here can help! I have a semi-old Scanning Electron Microscope, and was looking to upgrade the photographic capabilities by adding a digital camera. What I need is a USB camera (to be able to do captures of the various specimens on a PC), that can focus at a short distance (from about 8 inches down to about 4 inches), and that is capable of producing a high-resolution picture. Also, because of the size and shape of the opening, a cylindrical camera body would be preferable, but is not mandatory. And we really need it more for captures than for motion video. Am I asking too much? I have looked around, and determined that I just don't know what I am looking for! What type(s) of camera would you recommend. Thanks in advance for any information.