So have a look at the photo below, it's not post processed at all. There is some major vignetting in the corners. I like the effect, mind you, and I'd probably add it later. But that's just it, I'd rather to add it myself rather than having it somewhere I wouldn't want it. This is the first time I've noticed this effect honestly, I've never seen it before apart from a few shots I took during this day. I realize I'm at the maxima of my lens w.r.t. aperture and focal length, but I still wouldn't expect to see this at such a fast shutter speed. I was using a hood.
Tamron 17-50 f/2.8