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x10 camera X10 camera
I shot these tests with the X10 color camera that sells for about $80. I used my Sony camera to capture and digitize the video images.  These little cameras need lots of light. They also are a bit fuzzy up close.  For this test the loco was about 7 inches from the camera. I got one view with no diopter and then one with +1, +2, +3, and +4.  In my opinion the +1 gave the best balence between close focus and overall sharpness.  The actual video output looks better then these images would convey.
These images are a cropped section of a digitized screen capture.

To power this test I used two 7.2v Sony camera batteries.  The camera runs on 12v dc at less than 80mA.