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%18 not %18?


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#1 Eugene Lehnert

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Posted 05 July 2005 - 09:59 AM

I purchased a Fotokem chip chart and a %18 grey scale card from Ebay. Both say they are %18 but they are definately not %18, there is definately a stop difference between the two. What is the deal?

I guess I should be able to figure out which one is really %18 with the exposure information on the Kodak website. But why are they different?
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#2 David Mullen ASC

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Posted 05 July 2005 - 11:00 AM

The Fotokem chart I have folds in half.

On the left is a large 18% gray square with cyan, magenta, and yellow squares below it.

On the right is a 7-step gray scale with a large light gray field below it equal to Zone 6, I believe (one stop brighter than 18% gray, basically the Zone for caucasian skin tones, about 70 IRE in video). Then below that are red, green, and blue squares.

Perhaps you're looking at the light gray field on the right instead of the 18% gray field on the left.

It's easy to check by comparing an incident meter reading of the light hitting the card to the spot meter reading.

I have no idea what you got from Ebay.
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#3 Eugene Lehnert

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Posted 05 July 2005 - 12:02 PM

Yeah, I was using the %18 field on the left on the Fotokem. Yeah I don't know what I got on ebay either. It is definately a stop darker. I'll have to see what brand it is.
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