The Sekonic L-758DR DigitalMaster is the same as the L-758D however it features the Sekonic RT-32 which allows you to trigger PocketWizard systems. The L758DR is the first multi-function light meter. The L-758DR 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-758DR 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.