Samyang 8mm f/2.8 UMC Fisheye - Sample Images
Info and Reviews:
It is also sold under a number of different brands such as Walimex, Rokinon, Vivitar and Bower.
Optical design: 10 elements in 8 groups
1 Aspherical, 2 ED
Lens mount: Sony E-mount (NEX), Samsung NX, Fujifilm X, Canon M