Dennis Hopper, “The Lost Album,” at Kohn Gallery. In addition to being an actor, Hopper was a devoted photographer, who, for a period of 10 years, principally through the ‘60s, carried his camera with him wherever he went. In the process, he captured scenes on the street, celebrities at rest and his artist friends (figures such as Ed Ruscha and Billy Al Bengston). The exhibition, organized by curators Claudia Bohn-Spector and Sam Mellon, is drawn from an archive of more than 400 photographs that sat untouched in a box until after the artist’s death in 2010. An adjacent space will show works by Hopper contemporaries John Altoon, Wallace Berman, Bruce Conner and others