Nikon 20mm f/1.8G: Dusk Shooting, f/1.8 vs f/2.8
Get Nikon 20mm f/1.8 at B&H Photo.
The Nikon 20mm f/1.8G shows great potential for night shooting.
In my review of the Nikon 20/1.8G in DAP —
Shooting at Dusk: f/1.8 vs f/2.8 (D810, Egg Erratic)
This study should be useful to anyone shooting in dim light considering whether to use f/1.8 or f/2.8: the differences are significant, but the choice is one of several considerations.
See also Night Shooting.