Tack sharp pictures of hummingbirds require a flash setup. In this shot of a green-crowned brilliant hummer, I used four strobes -- one flash placed on either side of the bird, one behind it for a subtle backlight, and one on the large photo print background. If I didn't use a print of out of focus foliage behind the flower setup, the background would have been black. Since hummingbirds are diurnal (day flyers), that wouldn't look correct. The flash units were reduced to 1/16th power, and that shortened the flash duration (the actual amount of time the light in the flashes was on) to about 1/16,000th of a second. That's why the bird is so sharp. To compensate for the significant reduction in light, the flash units were placed about 15 inches from the flower. My settings were 1/200 (the sync speed), f/16, and 320 ISO. I used a 100-400mm telephoto for the shot. My photo tour to Peru in Sept. 2021 will allow participants to get shots like this of exotic hummingbirds.