Nikon has this wonderful function called high speed sync (FP) that allow us to use our Nikon flashes above our native sync speed of 1/250th of a second. This first photograph show our subject photographed using our normal sync speed of 1/250th at f/7.1
Shooting with an aperture of f/7.1 provide too much DOF for my taste. Using high speed sync allows me the choice to shoot this photograph using a much shallower DOF.
By opening my lens to f/1.4 and raising my shutter speed to 1/5000th of a second, I was able to produce a much different looking image.
One of the downfalls of using high speed sync is that your flash looses a tremendous amount of power. I believe the power setting on the flash for the photo above was set to about 1/4 power. I was using a Nikon SB-800 shot through a Lastolite Tri-Grip just outside of the right frame of this photo. When I moved to high speed sync, With the flash at the same position, the power needed to be increased to full power. Here is the resulting photo showing a much shallower DOF.
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