The Leaf

There's a story about photo detectives in the New York Times that's an interesting read.

From the story:

“The Leaf,” [pictured above] originally thought to have been made around 1839 or later, has become the talk of the photo-historical world. The speculation about its origins became so intense that Sotheby’s and the print’s owners decided earlier this month to postpone its auction, so that researchers could begin delving into whether the image may be, in fact, one of the oldest photographic images in existence, dating to the 1790s.