https://www.techradar.com/news/samyang-launches-its-first-af-lens-for-nikon-dslrs > Samyang is best known for its manual focus fixed focal length lenses. It has been branching out into autofocus optics for other brands, but the Samyang AF 14mm f/2.8 F is its first autofocus lens for Nikon DSLRs. > Designed for full-frame FX-format Nikon DSLRs, its 14mm focal length gives it a super-wide angle of view of 116.6 degrees, and its maximum aperture of f/2.8 should make it handy in low-light. On APS-C DX format Nikon bodies it will give an equivalent focal length of 21mm, which is still pretty wide, and handy for owners of these cameras since there are fewer prime lenses for the smaller DX-format.