You're correct Lou if you need to reduce the light for the shot that aperture, shutter speed, EV or ISO won't provide then an ND is it.  You can do a lot in PP but as you said that's not the question.
My problem is often too much light so I need an ND if I want a decent aperture (say f/11) and a reasonable shutter speed. So for ND's, work out your needs and do some simple maths.  Remembering they can be stacked (additively i.e. 2+4 = 6 stop) within reason.
In my situation I rarely use an ND2, but the 6 and 10 stop get used.  The 10 can be fun to use.  Also not all ND's are the same, some are not truly neutral and can give a colour cast.
				
			 
			
		 
			
				
			
			
				MY15 Discovery 4 SE SDV6
Past: 97 D1 Tdi, 03 D2a Td5, 08 Kimberley Kamper, 08 Defender 110 TDCi, 99 Defender 110 300Tdi[/SIZE]
			
			
		 
	
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