Flash Photography Basic Concepts

Fact 1

• Every flash photography is two exposures in one (ambient light exposure and a flash exposure) 

Fact 2

• Fill flash can be used when the subject is backlit or sidelit to eliminate silhouettes or shadows.

Fact 3

• Flash exposure is not affected by shutter speed but it is affected by aperture and iso settings.

Fact 4

• Flash illumination is dramatically affected by distance.

Fact 5

• Your camera measures ambient light and flash illumination separately.

Fact  6

• With automatic flash metering, the flash illumination is measured after the shutter button is pressed, and the flash output is adjusted accordingly.

Fact 7

• Every SLR camera with a mechanical shutter box has a maximum flash sync shutter speed. 

Fact 8

• Harsh lighting,washed out subjects and red eye can be illuminated by using diffusers and light bouncing.

Fact 9 

• It is possible to change the order of when the flash fires using "Rear Curtain Sync"

Fact 10

• Removing the flash from the top of the camera helps eliminate red eye and unflattering shadows.