for whatever its worth I use the solar tracking mode on my CG5 and have kept the sun on a touCam chip of a PST fo several hours
only problem is you only get a portion of the disk with a ToUcam-wouldnt you hate to be imaging the wrong end of the sun eh? at firrst contact,( which is what happened to me aduring the transit of Venus ) and you need to be sort of close to polar aligned to start with
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