Ansel Adams' grandson is unconvinced that several dozen glass plates found at a garage sale were photographic negatives created by the famed nature photographer.

Matthew Adams, who runs the Ansel Adams Gallery, said even if the photos are proven beyond a doubt to be authentic, they are not worth the $200 million value estimated by an art appraiser.

A lawyer for Rick Norsigian, the California man who paid $45 for the negatives a decade ago, said that based on overwhelming evidence gathered by a team experts "no reasonable person would have any doubt that these, in fact, were the long-lost images of Ansel Adams."

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