Remember, as with all of my prose, put tongue in cheek and Smile. A grain is way too much salt to take while reading this.

I first published my stop-of-light charts in the final years of the last century. I was attempting to make something that would help my students understand the importance of the numbers between what is considered the "whole" stop/step numbers. These numbers have been in common use for about the last 60 years plus. For photographers with many years of...