found at DigiDirect
The Samyang 8mm f/2.8 UMC Fisheye Lens is a high quality ultra wide angle lens designed exclusively for the Canon (M Mount), Sony NEX (E-mount), Samsung NX and Fujifilm X mount compact system cameras.
It gives an immense field of view - 180 degrees, with a 12mm (35mm equivalent) field of view. The 8mm is a diagonal fisheye lens for APS-C format, meaning that the image it produces fills the frame on APS-C cameras. As with all current Samyang lenses it is manual focus only. It is also compact, and lightweight, giving a perfect combination with Canon (M Mount), Sony NEX, Samsung NX or Fujifilm X mount compact system cameras.
The optical construction of the lens is 10 elements in 8 optical groups including one aspherical and two ED elements for optimum optical performance. The aperture consists of six diaphragm blades with apertures available from f/2.8 to f/22. It has an Internal focusing (IF) system which means the lens does not change in size when focusing. Additionally, the Samyang 8mm fisheye features the latest generation multilayer anti-reflection ultra multi-coating (UMC) to minimise flare and ghosting. The integrated lens hood also helps to reduce flare from behind the lens.