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Hi Matt
Can you give us some frames from a toucam AVI as you move through focus? Here is one I did earlier this year with my C11. Probably would have showed more a bit closer to focus. Extra focal on left and intrafocal on right. The result is extremely dependent on cooling and seeing though.
Something that may be of interest - I've read that SCTs are corrected for spherical aberration only for a specific distance between the primary and secondary mirrors (from the early days when everyone had a 1 1/4" visual back and simple eyepiece). When you extend the optical train with large 2" diagonals, barlows etc. you have to move the primary further forward to focus and need to expect some slight amount of spherical aberration, under or over correction, not sure which.
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