Re: Shooting the night sky.
1. Go somewhere dark
2. Use a shutter release cable
3. Use a fast lens (eg f2.8)
4. Use a fixed tripod or an equatorial tracking mount - you cannot take astro shots hand-held
5. Set the lens to widest aperture
6. Use a high ISO that isn't too noisy (eg 800 or 1600)
7. Focus on a bright star using test shots (eg 10secs ISO3200) or live view - try to get the star as small as possible.
8. Exposure length should be as long as possible - if using a fixed tripod, the maximum exposure will be 600/F (where F is the focal length) before motion of stars (relatively speaking) will show up in your pics. To this end, it is generally better to use a wide lens if you do not have a tracking mount
Post your pics up