Thank you for the theory of vertical, horizontal, and diagonal lines! This is a real question. When taking pictures of buildings/scapes, distortion often occurs due to the location (mainly below) of the subject or the nature of the lens. When that happens, I try to get as straight as I can and then I try to get it straight through calibration, and then I get too much cut off, and yet it doesn't fit vertically. How do I take it in the first place to prevent this? (If you're not a professional photographer, it's not easy to be in a good position to take pictures (=because buildings and landscapes are usually higher than me) And does using wide-angle lenses make this problem better?