I took this picture of two young nuns in Burma as they walked on the famous U Bain Bridge in the Mandalay area. The light was extremely low, and the major concern was the speed of the shutter. Assuming I wanted a sharp picture -- and I did -- the shutter had to be fast enough to freeze the movement from the boat as well as the motion of the nuns as they were walking. Depth of field was not a relevant consideration simply because I didn't have the luxury of using a small lens aperture given the fact that I was shooting at dusk. Therefore, the strategy I used was to raise the ISO until the shutter was fast enough to insure a sharp picture. I set the ISO to 2000 and saw that this gave me a speed of 1/200th of a second, and that's what I used.
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