| Birds | Acadian Flycatcher Empidonax virescens    Copyright David Seibel, 2012 (#5709) | Send Comment Camera: Canon EOS-1D Mark IV Exposure: 1/250 sec, f/8.0, ISO 2000 Lens: Canon 500mm f/4L IS + 1.4x II TC Date: May 24, 2012 Location: Mark Twain National Forest, Missouri, USA