Danny wants to take pictures of the Milky Way with his camera. Leo says that the key to doing this is a long exposure. He'll want to use a wide angle lens and a tripod. He'll also need a dark sky. He won't see much of it in the city. A high ISO is key, around 3200. He should have a minimum aperture of f2.8. The faster, the better.
Here's a great article by Jason Little at LightStalking.com.