1. every flash photography is two exposures in one . ambient light exposure flash exposure .
2. fill flash can be used when subject us backlight or side lit to eliminate silhouettes or shadows
3. flash exposure is not affected by shutter speed can change aperture iso but not shutter
4. flash illumination is dramatically affected by distance
5. your camera measure ambient light and flash illumination separately
6. with automatic flash metering , the flash illumination is measured after the shutter button is pressed , and the flags output is adjusted accordingly .
7. every SLR camera with a mechanical shutter box has a maxi flash sync shutter speed .
8. harsh lighting , washed out subjects and red eye can be eliminated by using diffusers and light bouncing .
9. it is possible to change the order of when the flash fires using "Rear Curtain Sync."
10. removing the flash from the top of the camera helps eliminate red eye and unflattering shadows .
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