A reader alerted me about this Rokinon 12mm f/7.4 RMC fisheye lens for Fujifilm X-mount. The same lens is available also for Sony E-mount and Micro Four Thirds (there is a similar Rokinon 7.5mm f/8 RMC fisheye lens for Nikon 1 mount). I have not seen it before and I do not remember seeing an official announcement (I could be wrong). Here are the detailed specifications:
Product highlights:
Rendering a unique perspective for creative applications, the Fujifilm X mount 12mm f/7.4 RMC Fisheye Lens from Rokinon is a manual focus prime featuring an expansive 167° diagonal angle of view. Benefitting the fisheye perspective of the lens is a 7-layer Rokinon Multi-Coating (RMC), along with a built-in petal type lens hood, which help to minimize surface reflections and lens flare for greater image contrast and color fidelity in a broad array of lighting conditions. Further emphasizing the perspective-altering attributes of the lens is an 11.8" minimum focusing distance, which pairs with the manual focus design to help in accentuating foreground subject matter and emphasizing a unique sense of space.
Technical specifications: