The 16 millimeter (mm) Variable-Interval Sequenced-Action Camera (VINSAC) is designed for inexpensive photographic recording of effective teacher instruction and use of instructional materials for teacher education and research purposes. The camera photographs single frames at preselected time intervals (.5 second to 20 seconds) which are displayed as sequenced pictures, and can be synchronized with a sound recording. Advantages stated are: the cost of raw film is approximately 4% that of standard motion picture equipment, the camera can operate unattended for over one hour, and the materials involve no special laboratory processes. VINSAC films can be displayed by any 16 mm projector equipped for single frame display, and synchronization of film with a tape is achieved with a standard commercial device. Cost of the camera and lens, timer-controller with disguise box, and display unit is approximately $365 to $525. (For related information, see EC 052 045.) (MC)