Exposure
Did you ever wonder what those numbers on the aperture ring really do? Or why one film speed is “faster” than another? You can get the answers to these, and many more questions about exposure. CMPG founder Geren Mortensen discusses the Basic Principles of Photographic Exposure in non-technical terms in this PDF document.
This is the full text and pictures from Geren’s exposure seminar, first presented during the CMPG meeting on August 18, 2004. You will need the Adobe Acrobat Reader, version 5 or later, or the Adobe Acrobat plug-in for your browser to view this document.

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