I used an old manual 2.8 135mm lens on my Pentax K10D to shoot Comet Lulin this morning at 4:36 am CST.
I used a simple barn door tracker for a 92 second shot at ISO 800. I adjusted for the black point a little bit in the photo to remove excess light coming from the moonrise. You can barely see what appears to be both the tail and anti-tail.
I am really looking forward to the potential of the comet.
I also picked up Comet Kushida last night with my 50 mm. Second picture.