This particular lens is equipped with auto focus to help you take that perfect picture. It could be the perfect thing if you're looking for a prime lens.
From JESSOPS
Samyang XP 10mm F3.5 Lens - Nikon F
Clifton Cameras
Samyang XP 10mm F3.5 AE - Nikon F-Mount Lens - 8039
WEX Photo Video
Samyang XP 10mm f3.5 Lens for Nikon F