I am always trying different ways to photograph Dragonflies and Damselflies. At one location most of the dragonflies are not where I can get close to get the detail I want. So I have to come up with different ways to photograph them. Here I was trying a 300mm lens with close focusing capability. I also added a 2X teleconverter, so using a Canon 1.6 crop sensor camera I had a FOV equivalent of 960mm of a full frame camera. Some shots I also added a short extension tube between the lens and the teleconverter which also enlarges the image on the sensor a little more. But doing this you cannot focus to infinity, but I did not need that ability to photograph Dragonflies.