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					Originally Posted by prostie1200
					
				 
				I have just taken delivery of a AFS300 f4 and am a little dissapointed in the sharpness of the initial shots. 
Here is photo of a Blackbird taken with a TC1.7E11 attatched. The camera was on a ridged tripod - ISO 200 - f6 1/40 at 500mm. it is cropped at 1467x1160 from the full frame with no sharpening or adjustments. 
Would you say its down to operator error or the Lens TC combo. 
			
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 I won't argue with what has already been said, but you could always try and damp the vibrations by using mirror lock up if you have it, and a cable release if not, and placing a bean bag over the lens. I'm sure a brick wall would provide a good test target for experimentation. 
Leif