I forgot to mention in the previous post that NYIP covered the "Sunny 16" rule in Lesson 6. The Sunny 16 rule says that on sunny days the approximately correct exposure settings would be f/16 with the shutter speed set approximately equal to the ISO speed. So if the ISO was 100 the aperture would be f/16 and the shutter speed would be 1/100th (give or take a little).
Jim Pickeral Digital Grin has an entertaining explanation of the Sunny 16 rule and explains how to adapt it to different conditions and apertures.
Ben Long at Complete Digital Photography defines exposure and discusses the 3 exposure controls (ISO, shutter speed, and aperture), the Sunny 16 rule, and reciprocity. We studied reciprocity in Lesson 6, but I didn't pay much attention. In my opinion, this article explains it much more clearly.
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