Zoom lenses were invented in the late 1920's, both for cameras and projectors. In their constant trolling for new ideas to bring in the public, some films were presented in "Magnavision" - meaning that the image, when projected could magicaly grow to a greater size on an expanded screen (made by opening the curtains), all achieved by a zoom lens in the projector. "IT" certainly had an early, striking use of a zoom lens in the opening; but it was not widely used until the 1960's. I could be wrong, but I believe this is when the term 'zoom' was used -- I don't think it was before; I am pretty sure Abel Gance used it in the 1920s and called it something very Gancian like "auto-perspecikon"). Then zoom lenses became so prevalent in cameras that hardly a shot could be made without them. With the advent of television production and RCA studio cameras that made it easier to shoot to tape with zooms instead of prime lenses on a turret, zooming was like breathing, and was much abused. "It" does remain a good example of one of the earliest uses, if not the earliest use of zooming.
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