Modern digital cameras do a lot of automatic white-balancing, aperture adjustment, focus adjustment, and shutter speed changes when you take photos. While this can be a helpful feature, if you snap a bunch of shots to stitch together, you can end up with an incongruently stitched image due to different exposures in each photo.
“Set your camera to manual focus and use aperture priority,” professional architectural photographer Barry Grossman says. “This way, your series of images will stitch much more effectively, with less variances that may degrade the final product.”
Take panorama photos from left to right and overlap a third of each image between your two shots to play it safe. This helps you have some extra room to work with when editing in whichever panorama software you choose.