using the Canon 1DC's histogram to judge exposure in 4K C-log

[Nicholas Natteau]

If you don't happen to have a light meter handy or a portable waveform monitor, and you had to rely on only the Canon 1DC's histogram, and you were shooting in Canon C-Log, what would the equivalent of 33% (18% grey card) and 62% IRE look like on the 1DC's histogram?



Assuming that the 4 vertical lines inside the histogram represent 20%, 40%, 60%, 80% image exposure.

Am I correct in assuming that to achieve proper image exposure in C-Log, an 18% (33% IRE) grey card would have to show up slightly more than half way between the 20% and 40% vertical lines on the 1DC's histogram? And that 90% white would have to show up just beyond the 60% vertical line (where 90% white in C-Log is at 62% IRE on a waveform monitor)?

Thank you in advance.

 

[marvinhello]

expose as usual with VA on and you'll have a correctly exposed C-Log image.

 

[Nicholas Natteau]

Hi marvinhello,

When you say "expose as usual with VA" do you mean that in Visual Assist mode, it's ok for white level to reach 90% and 18% grey to reach 50% or should whites be at 62% and mid greys be at 32%???

 

[marvinhello]

Hi marvinhello,

When you say "expose as usual with VA" do you mean that in Visual Assist mode, it's ok for white level to reach 90% and 18% grey to reach 50% or should whites be at 62% and mid greys be at 32%???

Yes the View Assist function.

when you expose 18% grey at 50% with View Assist on, the C-Log will give you 33%