Equipment needed for star photography is very basic, you will need a DSLR, a wide lens (I use an EF-S 18-135mm f/3.5), a sturdy tripod to ensure the camera doesn't move during the long exposure shots or during the time lapse shoot and an intervalometer which is a device which automatically takes a picture for you at set intervals of time. I use the Magic Lantern firmware hack on my Canon DSLR, this makes it to I can have a built in intervalometer which saves carrying extra equipment. I highly recomend taking warm clothes, you will not regret taking gloves and a beanie hat, as it will get cold standing outside at night doing nothing.
These are the settings that I used for the star trail examples below, these settings don't need to be copied exactly to get good results. Firstly make sure you are using a long shutter speed, I recommend between 25 to 30 seconds long, doing this allows for plenty of light to hit your DSLRs sensor which helps bring out the stars in the sky. You also need to make sure you are shooting with an aperture which is at least f/3.5 or lower. ISO depends on how much brightness you need, but I usually use ISO 1600 on my Canon T3i because anything higher is quite noisy.
clicking this link which will take you to the official website.
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