This web page has excerpts from the book titled "The confused photographer's guide to Photographic Exposure and the Simplified Zone System". It illustrates the basic function of the Pentax Digital Spot meter which is similar to Pentax Standard (analog) spot meter. It is designed for photographers who are familiar with the working of the camera and exposure but have never understood the proper application of Pentax Spot metering. If you need to know more or you want to understand the foundations of the simplified zone system, please refer to:

The confused photographer's guide to:
on-camera spotmetering

or

The confused photographer's guide to:
photographic exposure and the
Simplified Zone System