Q: How do you shoot in how light?
A: Increase the aperture (lower the F number if not listed in fractions)
Q: What if that's not enough?
A: Well, lower the shutter speed, increase ISO, and if necessary, put the camera on a tripod.
Q: What if the object is moving quickly? Tripod is not going to help.
A: Then use a flash or flashes.
Q: What if no flashes are allowed?
A: Well...remember the panning technique I talked about a couple of days ago?
Q: What if the objects do not move in a strait line, but instead in many different directions and speeds?
A: Then... you need a new camera with higher usable ISO.
As of this writing, Nikon D3s is the undisputed king of low light photography. Its maximum ISO is rated at an astonishing 102,400. That's one thousand times more sensitive than ISO 100 which is commonly used during daylight situations. At F/2.8 and 1/50sec, it has better sensitivity than our naked human eyes. Look at this picture I took during a performance:
The theme was Start Gazing, so it was really dark. I could barely see the audience and felt there seemed to be a column of people standing on the side ready to go on to the stage. So I turned my camera in that direction, and got this picture:
Then I knew why NASA had bought a bunch of D3s to be used on the International Space Station. Click HERE is you'd like to read more about that.