A big improvement in photography,based on Fox Talbot's work,was __________.

Question

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Fox Talbot's work laid the foundation for modern photography, but the big improvement came with the development of a means of creating multiple copies of an image. This was accomplished with the invention of photographic film and roll film cameras, which allowed for easier and faster mass production of photographs. Option A (keeping light out of the process) was already implemented in Talbot's work with the use of a dark room, while option B (long exposures) was gradually replaced by faster exposure times in later technological advancements. Option D (zoom lens) is a separate innovation that improved the ability to capture images at different magnifications, but did not directly build upon Talbot's work.

A Big Improvement in Photography,based on Fox Talbot's Work,was __________