Upload & Sell: On
All roads bent by distortion
The sb adds some barrel distortion. Do you have sb ultra or old sb?
Hah! The distortion often isn't visible, but it also takes a mustache shape so it isn't easy to correct when it matters.
On the other hand, from what I've seen so far, I might be content to carry only this lens on a daily basis. Between 28 and 50mm, none of my other lenses put it to shame; the 28-70 can even best all of them in some ways.
Mine is the original SB. I haven't seen evidence that the Ultra is much of an upgrade, though that may just be because there aren't many reviews for it out there. (I offered to do a review for Metabones, but they turned me down because they didn't have enough stock yet. Maybe I should email them again.) Then again, it probably won't be too long until an A7 costs as much as a Speed Booster, at which point I might just have to deal with my thumb digging into my right eye as I shoot with my left.