06-01-2017, 04:13 PM
To me, the internals of Canon and Nikon UWA look very different. Both have 14 lenses, the Canon appears to have less groups, but order and shape are very different. I wonder, if there are a lot possible designs for a (slow) 10-20, but Nikon's 10-24/3.5-4.5 isn't much faster. And Sigma's 10-20/3.5 pretty dated, although good.