I bet you never heard of Rokinon before, but the Rokinon name is a well known gem among night scape photographers everywhere. Want stunning night-scapes? Fast-glass is the key factor to create stunning night-time images.
The most important factor is how much light a lens will let in so we can shoot at lower ISO's. This means we'll need a lens with apertures of 2.8 or greater. But most consumer zoom lenses don't go to 2.8, while this is perfectly okay for daytime photography, it's not ideal for nightscapes.
Here's where prime lens come in. A prime lens is a fixed focal length that is designed to have much larger apertures. If you have every looked into the major manufacturer's primes (such as Nikon, Canon, or Sony) you may be thinking I'm crazy because they are expensive! Anywhere from $1000-$2500 dollars.
Relax, here is where Rokinon lens come to the rescue. A 14mm Rokinon f/2.8 lens is only around $360 dollars US. How can that be, you say?. Rokinon lens are totally manual, and have no autofocus.
Now before you go screaming into the night yelling MANUAL!! , NO AUTOFOCUS!!.. Think about it for a second.. If your shooting the night sky, autofocus is useless anyway. You must manually focus night sky shots for the best results. Is this starting to make sense? All you should care about is image quality.. how sharp are the optics, that's whats important.
Why spend $2000 dollars just to get autofocus?
The Rokinon 14mm f/2.8 is remarkably sharp and free of coma at f/2.8. Solid construction, very precise focus ring. It's one of my favorite lenses and insanely affordable. This is a great lens to get your feet wet in night photography.