3.1. What Is an Exposure?3.2. Over and Under Exposure3.2.1. Recognizing Under Exposure3.2.2. Recognizing Over Exposure3.3. What's the Correct Exposure3.4. Reading a Histogram3.5. Aperture, Time, and Sensitivity3.6. Equivalent Exposures3.7. One Best Exposure3.8. Bracketing for Exposure Insurance3.9. Q&A