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EI RATING for digital cameras


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#1 jaysonwilko

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Posted 15 May 2012 - 04:30 PM

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
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#2 Adrian Sierkowski

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Posted 15 May 2012 - 06:04 PM

You've got it right. It's the EI which renders either or both the most dynamic range or the least amount of noise. The sensors in a camera, like a film stock, have a certain response to light quanity when it hits the system; so they work that out to an "optimal" ISO/EI/ASA pick the acronym you'd like (though not DIN, because of the war). And when you change it in camera or in post, you are either adding or removing gain.
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#3 jaysonwilko

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Posted 15 May 2012 - 07:05 PM

Thank you for the response. I am very pleased. That question has been gnawing at my brain for a while.
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