I'm going to share a little secret here. It's something I use to distinguish a part of my work, so if any of you people come and compete with me on this, I'll send my Uncle Tony out to give you and your camera some lovin'. When we look up at buildings and other vertical structures, our eyes and brains work together to compensate for the odd visual effects that occur. If you stop and pay attention, however, you see that the buildings do not, in fact, appear straight. When look at 2d pictures, however, the reality becomes extremely noticable... and yet, for some reason people don't seem to bother trying to fix it. We just accept it as normal and move on. HOWEVER, a properly corrected image can have a much greater impact on the viewer. In many cases, the corrected image will feel significantly better to the viewer than the uncorrected one, and they may not even be able to tell you exactly why that is, unless they compare them side by side. Now in the past, the process of correction was a manual one and, while not crushingly hard, certainly not terribly easy. Nowadays a company called ePaperPress has a very nice and inexpensive tool called PTLens that greatly simplifies this process. (It still takes some skill and practice, but it's quite managable) Here is an example of the results... Here is a picture I took before any perspective correction... And here is the same image AFTER perspective correction... EDIT: btw, you may notice a TINY angle on the second shot... I've found it works well to leave the tiniest bit of an angle vs. bolt straight, and also keeps you from overdoing it, resulting in an odd Dr. Seuss-y effect.