Definitely motion blur. 
  
Top Advise from Don, I used manual exposure in my latest teleconverter test with flash.  Using flash allowed 1/400th f11 (effective) and produced dynamite sharpness from 70-200VR f2.8. 
  
Could you post a sharpness comparison with 70-200VR?
		 
		
		
		
		
		
		
			
		
		
		
		
		
	
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