Question about exposure with cine gammas

[Gogu]

Hello,

Read here and there about how to create profiles for the AF100 I came upon the Marvels profile, this one here:
http://marvelsfilm.wordpress.com/2011/08/08/panny-af100-af101-flat-picture-style-for-cinematic-look/

and in bottom of the post there is this info: " Update: If you use the Cine-D gamma setting, you should consider lighting the scene following old-school film practice: 55IRE max on faces! You will probably apply a curve to the picture, or adjust contrast and/or gamma in post -> kicking up the middle range up to around 70IRE again. Lighting caucasian skin over 55IRE with Cine D will result in problems if levels are lifted in post. "

Why should I put 55 IRE max on the faces ? Is it because I will bring the up in post as a consequence of this gamma being a little flat and they will end up being washed out ? Is this a good practice to follow when using any cinegamma on every other camera that has these options ?

And are the zebra options the same as when using the waveform, I mean, If I put the zebra at 70 is it the equivalent of 70 IRE on the waveform ?

Thanks

 

[hscully]

Thanks for sharing that article. It's pretty helpful regarding banding. I use the zebras as you described and the set values are IRE values as in the waveform.

 

[jmarkham]

The latitude compression at the upper range of the Cine gammas is pronounced. The more exposed parts of
your image will start to look flat if up at "the knee". He's suggesting keeping your talent down the curve... Good advice.