This was a fun shoot shot a while ago using my Canon 6D with the Tamron 17 -35 (old version). I also used a Flashpoint Zoom Li-on R2 TTL in high-speed sync so I could darken ambient sky.
This flash has plenty of power and by it using a lithium battery I can shoot for multiple days without recharging.
I plan to upgrade my wide-angle Tamron with the newer version or the Sigma 20mm 1.4 ART.