Most hummingbird setups I do involve four flash units -- three illuminating the birds and one puts light on the background photographic print. In this case, I used a single flash behind the flower and the hummer to create brilliant backlighting. The power of the flash unit was turned down to 1/16,000th power because that, in turn, made the flash duration (the actual amount of time the flash tube is on during the exposure) approximately 1/16,000th of a second. That is how you freeze the wings of hummingbirds. My settings were 1/125, f/32, 400 ISO, and I used a 70-200mm lens for the shot. My exposure settings were determined by several test shots. Since I wanted as much depth of field as possible, I needed to use the smallest aperture on the lens. By changing the flower-to-flash distance, I was able to adjust the exposure until f/32 gave me the exposure I wanted.
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