 Early examples of Exposure Simulation Live View (ES-LV) in advanced prosumer digicams with Full Manual / Manual ISO, such as Canon's PowerShot Pro70 (1998), Powershot G1 (2000) and Powershot Pro90 IS (2001), all feature an optical viewfinder or optical tunnel and display the preview image on their vari-angle swivel screen LCD.This gives a live real-time WYSIWYG (what you see is what you get) exposure simulation preview in Full Manual / Manual ISO mode, and Auto-Exposure (AE) / Manual ISO modes