Each has its own advantages and which one you choose to use is largely a matter of preference.
													
																	Canon 6d shutter speed increments. 
									
	
		
	
																	A indicates iso auto. 
																	Most digital cameras let you control shutter speed and aperture in 1 3 1 2 and full stop increments. 
																	How do i set the iso speed eos 6d. 
																	30 1 4000 sec 1 2 or 1 3 stop increments bulb total shutter speed range. 
															
													
									
	
		
	
																	At the minimum for 24 25 30 fps or 1 60 sec. 
																	Total shutter speed range. 
																	Iso speed setting increments. 
																	As indicated below the iso speed will be set automatically to suit the shooting mode. 
															
													
									
	
		
	
																	25600 in 1 3 stop increments. 
																	If the iso speed is set to a auto the actual iso speed to be set will be displayed when you press the shutter button halfway. 
																	For example 125 indicates 1 125 sec also 0 5 indicates 0 5 sec and 15 is 15 sec if you see a after the number then interpret the value to be read as a function of seconds. 
																	Or higher for 50 60 fps depending on the frame rate. 
															
													
									
	
		
	
																	I set this to shutter speed aperture which lets my 6d change my selected aperture or shutter speed if needed to get a good exposure in the av or tv mode. 
																	1 4000 to 30 sec x sync at 1 180 sec. 
																	The shutter speed signal accumulation time is limited to 1 4000 sec. 
																	Available range varies by shooting mode. 
															
													
									
	
		
	
																	Shutter speed display the shutter speeds from 8000 to 4 indicate the denominator of the fractional shutter speed. 
																	1 3 stop same here for iso. 
																	If set to iso this lets the 6d change a manually set iso if needed to get a correct exposure in any of the auto exposure modes. 
																	Available range varies by shooting mode. 
															
													
									
	
		
	
																	Most cameras come with 1 3rd stop increments as the default setting and a very large number of photographers never stray from it. 
																	I prefer 1 3 increments.