This is a picture of two myotis bats drinking on the wing at night. I took it in pitch darkness during a 30 second exposure in which the bats triggered the flash units at two different moments in time to create a double exposure. I had earlier in the evening focused manually on the position of the electronic beam that was projected across the man-made pond, and when the bats broke that beam in flight, the flash units, one on either side of the water, fired. The 30-second exposure repeated continuously for several hours until the camera battery died. In this way, the participants in the photo workshop and I captured many such flight shots in the Sonoran Desert of southern Arizona. My lens aperture was f/16, and the ISO was set to 1250.
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