I use a Canon 6D and a Rokinon (Samyang/Bower) 14mm f/2.8 for some fun UWA shots. I had already downloaded a lens profile using Adobe Lens Profile Downloader to correct for the mustache distortion. ...
I've put a dandelion chip (4th gen) on my Samyang 500mm f/6.3. I shoot a Canon 6D by the way. So, that's cool now I've set the chip to return f/6.3 and I can get a correctly exposed LiveView, EXIF ...