Quote Originally Posted by neuroanatomist
Else, I'd really recommend getting a rectilinear UWA like the Canon EF-S 10-22mm (or the Tokina 11-16mm, the Sigma 10-20mm, the Tamron 10-24mm, or the recently-announced but not yet available UUWA Sigma 8-16mm).

The Sigma, Tamron, & Canon 10-20mm's tend to be very dark in my VF due to the Ef-S screen installed. I haven't tried the Tokina but might try it in a few days time. I've tried the Sigma 15mm & 10mm. Both are quite sharp & the 15mm tends to be like a 24mm FOV w/c is not really that wide. I also haven't tried pp'ing the images. So, at this stage I don't have any clear idea of the effect of "de-fishing" the images. BTW, I've read the review of that Sigma 8-16 which wasn't that exciting at all.