High resolution scans of paintings

The following presents the results of an exercise to perform a high resolution scan of a painting. The motorised rail, camera and ring flash are shown below.

The lens used was 100mm on a 24MPixel full frame camera. The 24x20 grid of photographs stitched in PtGui.

Final image is 70,000 x 50,000 pixels, 3.5GPixels. 1/3 resolution linked below.