* Every flash photograph is two exposures in one.
*Fill flash can be used she the subject is backlit or side lit to eliminate silhouettes or shadows.
*Flash exposure is not affected by the shutter speed.( Aperture, ISO, NOT THE SHUTTER)
*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 adjust accordingly.
*Every SLR camera with a mechanical shutter box has a maximum flash sync speed.
*Harsh lighting washed out subjects and red eye can be eliminated by using diffusers and light bouncing.
*Its s possible to change the order of when he flash fires using " Rear Curtain Sync".
*Removing the flash from the top of the camera helps eliminate red eye and unflattering shadows.
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