LEXINGTON — The subtitle of “Lasting Light: 125 Years of Grand Canyon Photography” is a misnomer. The show runs through Jan. 6 at the National Heritage Museum. Yes, people have been photographing the canyon for well over a century. Timothy O’Sullivan took the first, in 1872. But the 60 frequently spectacular examples in “Lasting Light” come from just a slice of that span. The earliest one dates from 1972, the latest from 2006.
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