Thanks Nirofo 
 
Your last post regarding Electronics spured me to take  a look at the elecronic bayonet pins on the lens. They were furred and a gentle wash and bush up has made all the difference. - here's the first shot at 50 feet 500 at  
f4, much improved dont you think.
		 
		
		
		
			
		
		
		
		
		
		
		
		
	
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