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Great shots Mike.
I think to capture these comets well with a DSLR you have to either:
use a tracking device
use a widefield really fast lens like you did and 30-60 secs
use super high ISO like 12600 or more and ICNR and hope it works out.
stack lots of shorter exposures to get the signal
I found this whole process kind of educational about what works with these sort of shots.
Looking at the viewfinder is also not a good guide to the final result. It doesn't show up star rotation which with this comet are all on the left side of the image and the right side stars stay pretty round.
For the next comet I plan to use a portable tracking device like the Losmandy unit and use a 5DMk11 or 111 if its out and high ISO and a few minutes and a nice fast wide lens.
Greg.
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