#1 Every flash photograph is two exposures in one. There is ambient light exposure and a flash exposure.
#2 Fill Flash can be used when subject is backlit or sidelit to eliminate silhouettes or shadows.
#3 Flash Exposure is not affected by shutter speed
#4 Flash illumination is dramatically affected by distance
#5 Your camera measures ambient light and flash illumination separately
#6 With automatic flash metering, the flash illumination is measured after the shutter button is pressed, and the flash output is adjusted accordingly
#7 Every SLR camera with a mechanical shutter box has a maximum 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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