Zeiss 21 F2.8 could be another thought. I went that route then snatched up a 14mm Samyang for the times I need even wider.
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Can you please get a picture of the night sky with the lens fully open and see how the stars show at the corners? If the lens has coma (which even Canon L lenses have fully open) they will look like ... seagulls!
I dont understand it. Do u mean having this large focus ring is negative to manual focus with the viewfinder or positive?