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Most my comet imaging has been with telephotos.
Comets move against the starry backgound , so unless you track the comet , it will be burred somewhat unless the exposure is too short for it trail against the stars.
But then if it is too short an exposure , you not record much or as detail as you might hope to see.
It is best to keep the exposure short unless you are guiding on the comet's head manually , or autoguiding on it (not sure how you would do that with fuzzy object) ,or you can program the mount to track it from the comet's orbital elements.
My 10" newt in currently in pieces while I prepare to rebuild it (with a better tube) and while I wait for my Atlux to arrive. So wont be trying C/2007 W1 for a few months.
The trick is to experiment , and keep on trying , it'll be there for a little while.
BTW : Comets always show more detail in the negative image .... than in real colour positive image ....
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