Thanks for the comments.
John,
I'm not surprised that we could not see the tail visually with the 16" - it was very faint, to the extent that I had to slap a histogram equalisation on it.
Kevin,
Yes, there is some h-alpha emission in there but I haven't tried to identify it.
Alan,
Yes, it was a single 300 sec exposure. I made this astrograph specially for imaging comets.
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