Fact 2: Fill flash can be used when subject is backlit or side it to eliminate silhouette or shadows. Fills in light when natural isn't.
Fact 3: Flash exposure is not affected by shutter speed. Will be affected by aperture and ISO.
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 the shutter button is pressed, and the flash output is adjusting accordingly.
Fact 7: Every SLR camera with a mechanical shutter box has a maximum flash sync shutter speed.
Fact 8: Harsh, washed out subject, red eye, can all be compensated by defusers and light reflectors.
Fact 9: It is possible to change the order of when the flash fires by using rear curtain sync.
Fact 10: Removing the flash from the top the camera helps eliminate red eye and unwanted shadows.
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