This is a Samyang lens that comes with a Nikon F mount. It could be the perfect thing if you're looking for a prime lens.
From Amazon
Samyang XP 14 mm f2.4 Camera Lens for Nikon - Black
HDEW Cameras
Samyang XP 2,4/14 Nikon F
DigiBroadcast
Samyang 8041 XP 14mm F2.4 Nikon F Lens