I make quite a few stitched panoramics. Occasionally I shoot them when I go on holiday and find a cool place. Mostly, though, I shoot them when I’m location scouting. When I come across a new area to potentially photograph somebody in the future, I fire off a few shots to stitch in post. They’re very handy for that. But they often suffer from the same problem. All kinds of warping and perspective issues.
The effect is bad enough if your lens already has some natural distortion of its own. When multiple images are stitched it worsens the issue. This video from photographer Rex Jones comes to the rescue, though, showing us how we can correct it in Photoshop. A great method for perfect distortion free images.