Quick Reference Guide

Contents
21
Section Index
D. Preparing the camera and shooting
ISO can be a little more confusing. ISO is used to
determine the correct exposure for a camera when using
an external light meter. As dierent gamma curves require
slightly dierent exposure levels the optimum ISO (native
sensitivity) will vary depending on the gamma curve used.
STD Gamma curves = 800 ISO = 0dB
Hypergamma HG1, HG2, HG3, HG4 = 800 ISO = 0dB
Hypergamma HG7, HG8 = 1600 ISO = 0dB
S-Log2 and S-Log3 = 2000 ISO = 0dB
If you double the ISO, for example going from 800 ISO to
1600 ISO this is the same as adding 6dB of gain. So if you
are using STD gamma and the camera is set to 1600 ISO
that is the same as STD gamma at +6dB gain.
I recommend that to avoid confusion when in custom
mode you should use dB gain rather than ISO.