Thanks guys, I have just read the D300 manual again and there it is in black and white "Neutral gray or white object is placed under 
lighting that will be used in final photograph and 
white balance is measured by camera"  
Thanks again
		 
		
		
		
		
		
		
			
				__________________ 
				Lello
No amount of security is worth the suffering of a life lived chained to a routine that has killed your dreams. 
Lelsphotos
			 
		
		
		
		
		
	
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