Comets are something most of us don't often get a chance to photograph. 2013 offers two chances for possible comet photography. I say possible because as David Levy (Levy-Shoemaker Comet) said, "Comets are like cats; they have tails, and they do precisely what they want." Projections could fizzle or, as many of us hope, Comet ISON and Comet PANSTARRS could put on even bigger shows than expected.
So, fingers crossed and wishes said, let's move on to what you need (yes, including what kind of camera you need) to photograph ISON and PANSTARRS.