Comet 2005 L3 McNaught was a fairly faint, but long-lasting comet, peaking at about magnitude 15 in mid-2008, some 3 years after discovery! It was still visible at around magnitude 17 in early 2010.
Comet 2005 L3. June 9, 2007. Combination of 3, 3 minute images, SBIG ST-8XE CCD. 300mm f/6 newtonian at prime focus.
Comet 2005 L3. May 25, 2008. Combination of 5, 3 minute images, SBIG STL-1001E CCD. 16" f/10 schmidt-cassegrain at prime focus.