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Don't forget that the Samyang has no autofocus. So, if you decide to use it for anything other than nightscapes, you'll need to focus manually through the viewfinder or through LiveView.
Having said that, with widefield lenses, you're pretty much bang on if you focus at infinity.
Being a purist, I'd suggest sticking with Canon; DPP honours all Canon lens profiles natively -- it will correct all aberrations with the tick of a checkbox. While, the Tokina and others might be sharper than the Canon 10-22mm out of the box, DPPs lens optimizing modules will restore their sharpness at the edges and will resolve any distortion.
H
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