It’s very easy to accidentally shoot with the camera slightly skewed so that horizons or vertical objects aren’t straight. Most photo editing apps have a simple Straighten tool to put this right.
A broad term to describe the effect of your shooting position and the lens's focal length/angle of view on the appearance of the objects in your photo. Wideangle lenses tend to exaggerate perspective and convergence, e.g. converging verticals, because you tend to stand closer to your subject and tilt the camera more away from the horizontal, e.g. to get tall buildings into the frame.
See below for more topics connected with perspective.
A means of correcting converging verticals in architectural shots and other perspective issues. You can get ‘perspective control’ lenses which use complex lens adjustments to fix the problem optically, or you can use software with perspective correction tools.
Where the tops of tall buildings appear to converge. This happens when you’re so close you have to tilt the camera upwards to get everything in. You can correct it by choosing a more distant viewpoint and keeping the camera level, or by using keystone correction tools in software.
A type of perspective distortion caused by tilting the camera upwards to photograph tall buildings. It’s worse with wideangle lenses because they let you stand closer, so you tilt the camera even more. The only solution is to compose the shot with the camera completely level.