Definition of program mode in English English dictionary
An exposure mode on many automatic-exposure cameras in which the camera selects both the aperture and shutter speed The selections are made in accordance with a “program” that attempts to use the “best” combination for the lighting conditions At low light levels, the program usually attempts to minimize the effects of camera shake by selecting the lens’s largest aperture to allow use of the fastest shutter speed that will give the correct exposure At higher light levels that allow a shutter speed sufficiently fast to prevent camera motion blur, aperture is reduced as shutter speed is more gradually increased On cameras for which the program takes into account the lens focal length, a “sufficiently fast” shutter speed often is approximately the reciprocal of the lens focal length Some cameras offer the choice of more than one program; some cameras also include program shift that allows the user to override the program