This is a Samyang lens that has a maximum focal length of 8 mm and a minimum focusing distance of 0.3 m. The lens has a maximum ƒ/3.5 aperture and a minimum ƒ/22.
From Photospecialist
Samyang 8mm F/3.5 MC Nikon CSII
Firstcall Photographic
Samyang 8mm f/3.5 Aspherical IF MC Fisheye CS II Nikon AE