Day to night effect      
  Generally we use flash outdoors as a fill in but we can also use the flash as the main light and the sunlight as a fill in! Thats exactly what is done to achieve a darker sky or a twilight like sky in broad daylight.  To begin with choose an exposure which underexposes the whole scene by about 2 stops. The number of stops entirely depends on the kind of look you want to achieve. Amount of underexposure will decide how dark or deep the sky is. You may use the exposure compensation button on your camera to underexpose the image while shooting in aperture priority mode. On the other hand set the exposure compensation button on the flash to overexposure by the same number of steps. If the camera is underexposed by 2 stops, set the flash to overexpose by 2 stops. This will balance the exposure on the main subject where the flash light is falling but the background where the flash is not falling will remain underexposed.      
         
         
    In this particular picture i hand held the camera in a way so that i get the sun along the cross and thus the star burst effect. Photgraphed through a fisheye lens, i set the flash head to telephoto instead of wide which gave me a stronger spot kind of light on the face. Anyways, i did not need a wider throw of flash as the subject covers only the central postion.  
         
         
         
         
         
         
         
         
           

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