What happens when I change ALEXA’s Exposure Index (EI) setting?
With digital cameras, a change in EI will shift how many stops are available above and below 18% grey. At EI 800, ALEXA has 7 stops above and 7 stops below 18% grey. At EI 1600, there are more stops (8.4) available above and fewer (5.6) below 18% grey. At EI 400, there are fewer (6.3) above and more below (7.7) 18% grey. Each EI step shifts the location of 18% grey.
