By John Chumack
Here is my shot of Comet Lulin c/2007 N3 captured on 02-21-09 U.T.
this is a 93 minute exposure tracked on the nucleus of Comet Lulin, it shows nucleus, dust tail and Ion tail.
ISO 400, Canon Rebel Xsi DSLR(12meg-pixel), 5" Vixen Reflector, Losmandy G-11 Mount, captured from my observatories in Yellow Springs, Ohio, USA.