You will typically want to use a focal length of 24mm or preferably wider. I will describe in the settings section why you want a wide angle lens.
Also important is the focal length of the lens you use. Depth of field is not a concern due to the distance the stars are away. Star don’t emit much you, so you’ll want to gather as much light as possible in the shortest time possible. This differs from other types of landscape photography. But, you can get away with f4 or even f5.6, but this is not preferred. Ideally you will want a lens that has a maximum aperture of f2.8 or greater. To get the best results for Milky Way (star) photography you will want lenses with the following attributes: The closer you are to the city, the larger the impact city lights will have on the entire sky. This should be something to consider when selecting a location to shoot. The effect of the city lights would have been minimal. If this shot was taken in any other direction. It’s actually added some nice colour on the horizon and hasn’t had a massive impact on the stars. 
You can clearly see the glow from Perth on the horizon. This image shown here was shot at Guilderton in West Australia (about 100km’s from Perth). I have found approximately 200km works for me, but this is not a rule set in stone. But, if you are shooting in any other direction this effect will be minimised or nil. This will occur even if you are a couple hundred kilometres away (as shown in this image). If you are shooting in the direction of a city you will get a slight glow on the horizon. The direction you are shooting in will also play a part. You’ll want to be as far away from a city as practical.
In order to minimise the impact of city lights on your night photography.
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