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					Originally Posted by  Michael Hogan
					 
				 
				Im am buying a Canon EOS 40D and I want a walk around lens that I can use for wildlife photography especially birds. 
			
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 Going by your requirment..
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				 I have read mixed reviews about the 100-400 but none about the 300.
			
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 ..I would suggest 100-400. It's light to carry around. It's sharp and does justify it's cost.