1. 
   Fill flash
   Fill flash is a photographic technique used to brighten deep shadow areas, typically outdoors on sunny days, though the technique is useful any time the background is significantly brighter than the subject of the photograph, particularly in backlit subjects. To use fill flash, the aperture and shu...
   Found op http://en.wikipedia.org/wiki/Fill_flash
   
   
2. 
   Fill flash
   A flash technique used to brighten deep shadow areas, typically outdoors on sunny days. Some digital cameras include a fill flash mode that forces the flash to fire, even in bright light.
   Found op http://www.microsoft.com/windowsxp/using/digitalphotography/glossary/defaul
   
   
3. 
   Fill-flash
   A method of flash photography that combines flash illumination and ambient light, but does not attempt to balance these two types of illumination. A technique that uses flash illumination as a supplement to ambient light. Useful when photographing subjects that are backlit, with very high-contrast l...
   Found op http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
   
   
4. 
   Fill-flash
   A technique that uses flash illumination as a supplement to ambient light. Useful when photographing subjects that are backlit, with very high-contrast lighting or in shadow
   Found op http://www.digitalexposure.ca/sub1.html
   
   

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