The Sekonic L-758D DigitalMaster is the first multi-function light meter. The L-758D can be calibrated to the sensitivity of your digital sensor or film stock. This design has been improved from the L-558, which means improved features. The L-758D can measure 1-degree for spot metering which in addition to having a retractable lumisphere give photographers extensive options to get accurate readings in all types of lighting conditions. The head also rotates 270 degrees which gives you the ability to measure light from the opposite direction you read the display from.