Samyang has a new XP 10mm f/3.5 lens on flaunt at Photokina 2018. The XP 10mm f/3.5 lens is a full frame optic which Samyang say is the world's widest full frame lens. The lens on display has a Canon EF lens mount.
Samyang XP 10mm f/3.5 Hands-On Photos of Equipment
The lens boasts a zero distortion recti-linear lay out and Glass Mold aspherical lens elements. Samyang say it will work with 50-megapixel high-resolution cameras.