Sorry for all the Heron and Eagle pictures lately but there are only so many types of birds around here where I live especially this time of year. Both of these pictures are taken with the Nikon 18-300 at 300mm, aperture at f8. This lens like so many other lenses appears to be a little sharper at f8 than wide open as evidenced in these two pictures.
The bottom photo is a good example of what happens when you take "birds in flight" pictures at relatively slow shutter speeds (1/250), though the birds eye, the most important part is in focus. What I really needed for this shot was a higher shutter speed and the 10 pound, $9,769.00 Nikon f2.8 400mm ED VR AF to get all this fellows feathers frozen. Ha ha!