Abstract:To solve the existence of poor synchronization and large error in the sky luminance test, using fish-eye lens digital camera test sky luminance. Through researching on fish-eye lens and the optical characteristics of digital cameras, get the method that extract the luminance and location information of the measured sky element from digital photos, and determine the exposure parameters and the record range of linear brightness. Analyzing and amending the stability of the camera and light transmission rate of fish-eye lens, get a more accurate test values of sky luminance distribution. This provide important techniques means for daylighting research and daylighting observation.