THE MORNING CRITTER-SHOOT YIELD

The hummingbirds are skitish today.  Won't tolerate me.  The problem today was keeping the target in focus.  The auto focus wants to pop to the background and won't re-acquire because the target is too close.  After a little bit I get arm weary from holding up the D800 plus 70-200 plus 1.6X teleconverter.  The teleconverter is over-kill but I am avoiding taking it off because of dust.  I use it for other subjects as well.  I really should set up the 400mm on a tripod and gimbal for shots like this and shoot from back inside the family room.  The tripod would be very crowded and so would I.  Can't win for losing.