Samyang 24mm f/1.4
Another solid performer at a very reasonable price. Sharp and nearly free of coma at f/2. Compare this to Nikon or Canon's version which have to be stopped down to f/4 to eliminate coma. This is my go to lens in nearly any situation. You will not regret buying this lens.
Samyang 35mm f/1.4
Not as good as the 24mm, but still a good lens if you stop it down to f/2
Samyang 16mm f/2.0
Another great lens from Rokinon that is very fast at this focal length and is reasonably priced.
Available for Canon, Nikon, Sony, Pentax and Sigma
Recommended lesnses for night photography
Nikkor 50mm f/1.8g by Nikon
a great lens especially for portraits it is very fast and it is also autofocused. You can use it in Astrophotography but because of its mm don't expect the best results.
Tokina 11-16mm f/2.8
If you have an APS-C sensor this is your go-to lens. Fast, wide, sharp and low on coma. There are two versions of this lens, both perform well, the newest version will likely outperform the old version, but I have not tested them side-by-side yet.
Available for Canon, Nikon and Sony
Samyang 14mm f/2.8
Remarkably sharp and free of coma at f/2.8. Solid construction, very precise focus ring. One of my favorite lenses and insanely affordable. This is a great lens to get your feet wet in night photography.