There are two types of photographers:
Those who take what their camera gives them and
those who make what their camera gives them.
What separates the two is skill.

Canon EOS Elan 7 E Partial Metering
(spot metering / spot metering) application using Farzad's 
simplified 5-stop zone system for color slides, Black and white, and Digital Photography
(Based on Farzad's 5-stop Film / Digital zone system ©1987-2005) 

The 5-stop Tone Ruler

Compliments of cpgbooks -
The Confused Photographer's Guide to
On-camera Spotmetering
(Spot Metering / Partial Metering)
and
The Confused Photographer's Guide to Photographic Exposure and the Simplified Zone System

The confused photographer's exposure guides by Bahman Farzad