Samyang 8mm f/3.5 Fisheye CS II

Samyang 8mm F3.5 UMC Fish-Eye CS II

Rokinon brand, older version without removable lens hood
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
Unique features	Diagonal fisheye
Application	video, general
Physical
Max. length	72.6 mm (2.86 in)–101.4 mm (3.99 in) (depends on the mount)
Diameter	77.8 mm (3.06 in)
Weight	410 g (14 oz)–515 g (18.2 oz) (depends on the mount)
Filter diameter	not possible
Angle of view
Diagonal	139.3°–180° (depends on the mount)

The Samyang 8mm F3.5 UMC Fish-Eye CS II is a fisheye photographic lens using the stereographic projection and is designed for crop factor APS-C DSLRs. It is made by Samyang Optics and marketed under several brand names, including Rokinon. It is made in South Korea.

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 II version of the lens has a removable lens hood.