Since I don't have a good telescope or tracking mount, I've been exploring the possibilities with what I have (mostly my new 135mm f2.8 lens). And I discovered Deep Sky Stacker, which makes pictures so much clearer. Here are a few I took this weekend when the clouds finally cleared. There's a lot of light pollution around me, and I can't even see the Andromeda galaxy, which makes it hard to find.
Andromeda Galaxy (16 images stacked, 4 seconds, f2.8, ISO 12800)
Pleiades Star Cluster (50 images stacked, 4 seconds, f2.8, ISO 6400)
Orion Nebula (50 images stacked, 4 seconds, f2.8, ISO 6400)
I'm sure other posters in this thread have used Deep Sky Stacker. Does anyone know a website that shows the best settings to use? It's a little hard to experiment when each of these pictures takes an hour to make.