For ES-LV digicam users and ExpSim LV DSLR users, this advanced method of "Adjustable/Selectable Live Previewable Exposure Evaluation/Determination" shooting in Full Manual / M ISO mode completely eliminated light meter sensor reading TTL common from the film era, making optimally desired exposure selection with live preview rear monitor screens virtually "instant at a glance", and time was saved doing any spot/area evaluative light metering TTL, which non-ES-LV and totally non-LV DSLR users doing the TTL "light meter reading" routine, same as their film SLR counterparts.