Digital Zone System with Canon PowerShot G3
Link to other camera-specific Zone System sites

4.5% Black

9% Dark Gray

18% Medium Gray

36% Light Gray

72% White

028 Gray Scale Density

078 Gray Scale Density

128 Gray Scale Density

178 Gray Scale Density

228 Gray Scale Density

Farzad's 5-Stop Tone Ruler, the ruler for our Simplified Digital Zone System with approximate Gray Scale densities (000-255) for your monitor 

Compliments of cpgbooks -

The confused photographer's exposure guides by Bahman Farzad