Cleaning lenses with recessed rear element
			 
			 
			
		
		
		
			
			I have several lenses with recessed rear elements and it struck me what happens it the rear element becomes contaminated with dust.  How would I clean it? 
  
I am thinking this as I have discovered that long and heavy lenses are best transported detached from any camera body.  So I intend to mount any long lens when I am ready to use such equipment.
		 
		
		
		
		
		
		
			
		
		
		
		
		
	
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