I was playng with a 300mm f2.8 AF-S lens
and 1.7 extender. Spike was meandering around
so I snapped this photo. He was 50 feet out.
Sharpness is plenty good!
Lens was closed 1 stop,making f5.6 effective.
Nikon D2x 1/320s f/5.6 at 510.0mm iso100
300mm f 2.8 AF-S w/ TC17EII
full exif