I had a go tonight with a crappy old 2MP Canon Powershot A40.
Last night I could swear I could see the tail wrap right back down to the horizon naked eye. My mum came and had a look with me and said she could too.
I have no light polution between me and the comet, just the Indian Ocean, so I decided to try and catch this, and I think I have.
The photo is a stack of four rediculously grainy shots @ 400 asa (not really grain... noise) from a very dodgy camera, and then levels and gamma adjusted, all done in Photoshop. This is the first time I've ever processed an image or stacked so..... eh.
The stacking helped reduce the grain massively, even so it was still very grainy so the image is shown pretty small to make it kinda smooth out a little
Wasn't trying to get a high res shot, just bring out the extent of the tail.
Edit: to give an idea of how $*#& this camera is, added one of the 4 noisy images
HERE, LOL
Damn loomberah! Wish I had your gear!