The L-508 is also a full-function incident meter for ambient, flash or mixed light measurement. It features a 270' swivel head and built-in retractable incident lumisphere - a Sekonic exclusive. Incident measurement allows the photographer to read the light falling on the subject, without being mislead by the subject's color or reflectance. The 270' swivel head permits ideal positioning of the retractable lumisphere allowing the photographer constant viewing of the large, easy to read digital display panel from any angle. The retractable, dual position function eliminates the need for interchangeable spherical and flat incident diffusers. In extended position, the lumisphere gives accurate incident measurement of normal scenes and lighting. In recessed position, the lumisphere acts as a flat diffuser and is used for directional, selective measurement and comparison/control of shadow and highlight areas for determination of brightness range or lighting ratio, or measurement of flat surfaces for copy work.