Originally Posted by sambonator
Unless you're taking pictures of moving cars, you don't need a fast lens. You just need a good tripod and a decent lens, and stopping down on the aperture.
I would have to disagree a bit here. The faster the lens, the more options you have. In sunlight it's not as important, because you can more easily make up the difference in shutter speed. At night, when you're already doing a slow shutter speed, the 3-4 f/ stop difference could turn your 5 second exposure into a 20 second exposure. That's a big difference to me.