If you want to make sure you don't scare away the dragonflies by getting too close with the camera...
... you can try to capture dragonflies with Z 180-600 & 1.4TC at 840mm...
About the underneath image: Resized to 1250px longest side, saved in PS in 9/12 quality. +1 EV reset to 0 EV. Conversion from NEF in Nikon NX studio - vivid.
And, it works way better than I expected.
Kindest regards,
Stany
www.fotografie.cafe