Every flash photograph is two exposures in one
- ambient light exposure
- flash exposure
Fill flash can be used when subject is backlit or side lit to eliminate silhouettes or shadows
Flash exposure is not affected by shutter speed
Flash illumination is dramatically affected by distance
Your camera measures ambient light and flash illumination separately
With automatic flash metering, the flash illumination is measured after the shutter button is pressed and the flash output is adjusted accordingly
Every SLR camera with a mechanical shutter box has a maximum flash sync shutter speed
Harsh lighting, washed out subjects and red eye can be eliminated by using diffusers and light bouncing
It is possible to change the order of when the flash fires using "Rear Curtain Sync"
Removing flash from the top of the camera helps eliminate red eye and unflattering shadows
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