How to expose logarithmic gamma correctly ?

[JensenBreck]

hello,

So we set our camera and seconic light meter to 800 ISO and used the spot meter right next to the camera on the 18% Gray chart. We got a value of F 5.68.
Our next step was to set the lens to a F-stop of nearly F 5.68. The waveform gave us a value of 26%.

This is not only a big difference to 34,3%, the value of canon, the picture was clearly underexposed.
Of course, we asked us what our mistake was.
Was it the fault of the video? Is our gray card not standardized? Is our light meter broken? Is a F 5.68 not a F 5.68 on the lens we used, maybe its broken? Is the camera screwing us?

Please help.
Thanks!

I didn't find the right solution from the Internet.


Reference:
http://www.cinematography.com/index.php?showtopic=75718


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