Photomerge
People have been sticking photos together to create panoramic images for close to a hundred years, with varying degrees of success. The scissors and glue method rarely succeeds. Shooting a panorama all in one photo with a wide-angle lens seems to work, until you notice that the ends of the Grand Canyon are very fuzzy, or the two outermost bridesmaids in the wedding lineup appear 50 pounds heavier than they actually are.
Distortion is the problem. Wide-angle lenses aren't good choices in situations where you want to avoid distortion. The more curve you apply to the front of the lens, the more glass the image has to pass through. Glass adds distortion. The more logical way to shoot a panorama that stays in focus from one end to the other ...
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