Straighten Things Out

If you prefer to get your perspective as straight as possible in-camera but you don’t have a tilt-shift lens, there is a solution.  You have just taken a shot of a building, possibly with a 20mm lens, and are standing close to it and looking up.
If possible, step back and switch to a longer lens. You’ll be able to keep your camera level and avoid converging verticals – though your subject will be smaller in the frame.
Marg Jackman