Shooting fast moving dragonflies in flight offers a challenge for photographers. Good gear definitely helps, but so does steady hands smoothly tracking the subject, and an awareness of the dragonfly's habits. I noticed that this one tended to pause and hover in one particular spot as it made its circuit, and I was ready for it. I made the image with the spectacular new Canon 7D Mark II coupled with a Canon 100-400 mm 4.5/5.6 II lens. This is an amazing combo for nature photography. The parameters of this particular shot were f/6.3, 1/640 of a second shutter speed, ISO 160, no flash, and lens fully extended to 400 mm.
The 100-400 lens focuses down to about three feet, and thus can work well for plants and other nearby objects.