Every Flash Photograph is two exposures in one.
Fill Flash can be used when subject is backlit or side lit to eliminate silhouettes or shadows
Flash exposure is not effected by shutter speed
Flash illumination is dramatically affected by distance
Your camera measures ambient light and flash illumination separately.
With auto flash metering, the flash illumination is measured after the shutter is pressed, and the flash output is adjusted accordingly.
Every SLR camera with a mechanical shutter box has a max 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 the flash from the top of the camera helps remove red eye and unflattering shadows
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