Flash Photography Basic Concepts Fact #1. 2 exposures in one. Ambient light exposure, and flash exposure. Fact #2. Fill flash can be used when subject is backlit or sidelit to eliminate silhouettes or shadows. Fact #3. Flash exposure is not affected by shutter speed. Aperture and ISO change it, but not the shutter. Fact #4. Flash illumination is dramatically affected by distance. Distance increases then flash illumination cuts in half. Fact #5. Camera measures ambient light and flash illumination separately. Fact #6. With automatic flash metering, the flash illumination is measured after...
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