Many thanks Mike - very useful link. It seems that with a suitable knowledge of PS using a Hoya R72 gives some good results. 
I would still be interested to know if anyone has any experience of a Lee IR filter with a 20D as the Hoya screw ones a more expensive especially the 77mm! 
Thanks again 
Paul
		 
		
		
		
		
		
		
			
		
		
		
		
		
	
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