The Irix 11mm f/4 lenses (Blackstone & Firefly) for Nikon, Canon and Pentax DSLR cameras are now up to $50 off at B&H:
Additional coverage of the Irix 11mm f/4 lens:
https://photorumors.com/2017/03/02/irix-11mm-f4-lens-officially-announced/
Irix 11mm f/4 lens additional coverage (sample photos, reviews)
Irix released Adobe Lightroom lens profiles for their 11mm f/4 and 15mm f/2.4 wide angle lenses