Flash Fact and Skills

PART I

1. Every flash photograph is two exposures in one.

2. Flash exposure is not affected by shutter speed.
 
3. Flash illumination is dramatically affected by distance.

4. Your camera measures ambient light and flash illumination separately. The fact that you have your flash turned on has no effect on this.

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

6. Every SLR camera with a mechanical shutter has a maximum flash sync shutter speed
 
7. If you set your shutter speed faster than flash sync, or use Av mode with an aperture setting that requires a shutter speed faster than flash sync for proper exposure, the camera will automatically revert to flash sync speed when the shot is taken if a built-in or hotshoe-mounted flash is turned on.

 PART II

1. The further your subject, the more powerful flash you need.

2. No, ambient light 

3. At a certain point, your flash simply doesn’t have enough power to effectively illuminate and reflect light back to your camera.  

4. 1/200th

5. The guide number (GN) is the product of the aperture (f/ stop) and distance (from flash to subject) combination that will result in enough light for proper exposure.  

6. Angle your flash head at 45 degrees or off a wall at 45 degrees for a side bounce.

7. A more pleasing shadow and voiding the side flash.

PART III