What is EDR?
EDR stands for “Extreme Dynamic Range”. It is a capability first pioneered and introduced by Vision Research. If you are shooting an event that has high contrast, you may need to adjust the camera exposure (lens aperature and exposure time) such that you can see details in the dark part of the image. However, this may mean that the light/bright parts of the image are overexposed and become saturated. The EDR features give you two exposure times for a single frame. Here is how it works at a high level: Assume your camera is set up for a 100 microsecond exposure (exp) and EDR is set to 75 (edr). At a certain time during the frame exposure (calculated as exp-edr) the camera will reset all pixels that are above a pre-set threshold back to that threshold and then allow all pixels to continue being exposed. This pre-set threshold is set at the factory to a level that is about midway between black and saturation. It is kind of like putting a brake on those pixels that are charging so fast the
