Night Photography Idea

Start a 5-10 min exposure in perfect focus (focus at infinity). At increments during the shot defocus your camera by small amounts. The shorter the increments and smaller the focus change the better the result. The result should be cone shapes (instead of points of light) because the stars will move through the frame as they become larger (de-focused) blobs of light. The reason for doing this: unfocused images show their color much better than tiny points of light. You will be able to compare the red/yellow/white/blue etc. colors of the different stars. From wikihow.