The Sekonic Speedmaster L-858D is the result of the combination between 60 years of Sekonic innovation and the latest technological advances in flash measurement, aimed at meeting the needs of today's photographers and cameramen. Capable of measuring the duration of a flash, which is a first for a multifunction spectrometer, the L-858D provides critical data related to flash and necessary in the calculation of the ambient flash exposure. As its name suggests, the Speedmaster L-858D also measures the short flashes of the HSS flashes (High Speed Sync) for better control of the precision of the exposure due to the flash. The L-858D has the fundamental characteristics of the popular L-478D as well as functions that allow photographers to get rid of the limits of ISO sensitivity, the duration of exposure in ambient light and flash, as well as frequencies of 'Images (f/s) and shutter angles for videographers. An increased sensitivity of sensors for incident and reflected sources in ambient light makes it possible to carry out measurements even in very low conditions. In addition, the L-858D is offered with optional wireless trigger modules, now available for Elinchrom and Phottix, in addition to the radio trigger devices in the PocketWizard range. With its 2.7 ’’ color touch screen and really innovative and sophisticated advanced features, the L-858D creates a rupture to enter light measurement in a new dimension.