Founded in 1952 by Ansel Adams, Minor White, Dorothea Lange and other significant image-takers of the time, Aperture magazine has been described by industry professionals as "the most serious and the most valuable periodical in the photographic world" and "a permanent testimonial to the great photographers of our time." This weekend, the Museum of Fine Art debuts Photography Past/Forward: Aperture at 50, celebrating the magazine's longevity with 156 images culled from every period of its history. The pictures address everything from social and political issues to sexuality, spirituality and nature. Accompanying the exhibit is a selection of works from the museum's own collection, Photography Before Aperture, 1900-1952, which features photos by Paul Strand, Edward Weston and Margaret Bourke-White, to name a few. Through April 30, 255 Beach Drive N.E., St. Petersburg, $8 adults/$7 seniors/$4 students (free admission for kdis 6 and younger), 727-896-2667, www,fine-arts.org.