One more Bird In Flight for this series. Here are some White Ibises flying in to our location. Here I was using a 300-800mm Sigma DG APO Zoom on a heavy duty Gitzo tripod and Wimberly Gimbal head. This gives me the option of zooming to 300mm to help find my subject then zoom in for my shots. This is a tremendous help in getting the shot. Going to 300mm you have a much wider view to find, frame and zoom in to your subject. If you ever tried to find a fast moving bird flying at 800mm you know what I am saying. The Sigma 300-800mm zoom is about 13 lbs, with the camera, gimbal head and heavy Carbon Fiber Gitzo tripod I am over 25 lbs, so you tend to get set up in a location and wait and see what comes to you or what crosses your path. It is also handy when your subjects get close you can zoom down to continue to photograph them. It seems like there is this unwritten law that whatever lens you have, you need something longer or shorter, so this is my best alternative so far. I usually also have my 400mm with me for faster moving subjects or if I wander away from my tripod setup.