Do not get misled. I am not an expert in night photography. Not at all. There are plenty out there such as Ben Canales, just to name one. I have not taken more than a dozen night shots in my life. And at least ten of them with my iphone when drinking at a friend's stag night. Hence this is not a tutorial for shooting stars. Look at Alister Benn's articlesif you want to read a truly good one.