I never thought I'd use the keystone feature but recently I need to take photos of an LED screen from an instrument used in aircraft inspections. Using this feature, I was able to tip the screen away from the camera to reduce reflections and bring the sideds back to square with the adjustment. This made it really easy crop the images for a report. I just wish that basic exposure controls were available while keystoning is in use, exposure adjust etc. Good job Olympus.