The Samyang 8mm f/3.5 fisheye is a fisheye photographic lens using the stereographic projection and is designed for crop factor APS-C DSLRs.^[1] It is made in South Korea by Samyang Optics and marketed under several brand names, including Rokinon.

Samyang 8mm F3.5 Fish-Eye

Maker	Samyang Optics
Technical data
Type	fisheye
Focal length	8 mm
Aperture (max/min)	f/ 3.5 - f/ 22
Close focus distance	0.3 m (0.98 ft)
Diaphragm blades	7
Construction	10 elements in 7 groups
Features
Lens-based stabilization	No
Macro capable	No
Aperture ring	Yes
Application	video, general
Physical
Max. length	74.8 mm (2.94 in)–103.6 mm (4.08 in) (depends on the mount)
Diameter	75 mm (3.0 in)
Weight	411 g (14.5 oz)–516 g (18.2 oz) (depends on the mount)
Filter diameter	not possible
Angle of view
Diagonal	139.3°–180° (depends on the mount)

The lens uses manual focus only. For most versions of the lens, the aperture must be set manually. For Nikon there are versions with and without a chip to communicate aperture information with the camera. Versions with the chip (model AE8M-N) can set the aperture automatically. The CS version of the lens has a fixed lens hood.