I am a bit confused about something that probably has a simple answer. I am confused about rating cameras with the 18% grey card test. RED, the Alexa and many other digital cinema cameras have a range of IE settings but I keep reading about DPs "rating a camera" at a particular EI (RED 320, Alexa 800, and so forth) is this simply the EI that is the optimal EI setting for that particular camera or am I missing something else here? This has been bugging me for a while as I learn more and more.
Love to hear the answer and thank you for sharing your knowledge with a guy just getting started.
Thanks,
Jayson L. Wilkins