I'm looking for a wider lens then my 35 1.4L on fullframe for abandonned buildings (urbex) not too expensive.
I don't want to buy the expensive 16-35 II anymore (had it in past), as corners aren't sharp either if you pay double the price.
I'm doubting of following lenses :
Canon 24 2.8
Sigma 15-30 f3.5-f4.5
or buy back the Canon 17-40 f4L which I had in past.
But this last one isn't spectacular either, check this compared to the Sigma 15-30 : http://www.16-9.net/ultrawides/
