Getting the shot is not always easy in low light (sun was setting) and fast action.  Setting the camera on continuous focus is a must. First of all, it is nearly impossible to manually focus on a fast moving object like a bird in flight. You must pan the camera with the flight pattern of the bird. To add to the complication is the fact the the camera is zoomed out to 200mm. I shot these at 160 second at f/5.6.  This was fast enough to stop the action to an extent with enough depth of field to keep most of the large birds in focus.

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