Auction introduction: This year marks the 50th Anniversary of Sotheby's Photographs in New York. Since that noteworthy sale in 1975, Sotheby's has been at the forefront of the photographs market, continually setting new world records by bringing the most compelling works to auction. Sotheby's spring Photographs auction in New York will bring together an exciting range of photographs by many of the most sought-after artists across the full 186 year history of the medium.