Springing up in 1970 UWS as a weekends-only screening room, Film Forum is now the Houston Street mecca for tri-state cinephiles. Its sustained pull and prominence can be traced to Karen Cooper — the institution's director since 1972 — and her rarely erring eye for new essentials. As part of MoMA's hat-tip to the Forum's 40th, Cooper curates this 22-program run of nonfiction films that she helped premiere. With complementary short films like Herzog's Guadeloupe-set La Soufrière, the compelling slate features the well-known and the what's-that; among them are Terry Zwigoff's Crumb, Heddy Honigmann's profile of Parisian buskers The Underground Orchestra, and Bruce Weber's mesmeric look at the talented/tainted Chet Baker, Let's Get Lost.