Hi Paul,
I don't have any experience with the Samyang but I bought a Tokina 11-16mm f2.8 before an eclipse trip to Svalbard earlier this year (for use on a very battered, old, temperamental Canon 400D), and I used it for photographing aurora. It's a beautiful lens, I'm very happy with it. It was wonderful for all those wide snow covered landscapes too.
Cheers,
Cathi
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