When photographing a flat architectural surface where there are windows or doors, you can make their vertical lines parallel with the left and right sides of the frame by making the back of the camera as parallel as possible to the plane of the surface of the building. If the windows are above you, even a little, they will appear to be angled inward (this is keystoning) because you have to tilt the camera upward to compose the picture well, thus making the back of the camera oblique to the wall. However, if you move back and use a longer lens, the windows and doors become more and more parallel as they appear in your viewfinder the further you go from the wall.
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