srt101fan wrote:
Thank you, Bebu, I think this is the kind of information the OP was interested in! With this info, and something similar for Auto ISO used with shutter priority, he can better decide which way to go.
But, then again, maybe that's not what the OP is looking for at all. I wish he'd come back and comment! 😐
(PS - Auto ISO with P! Now that is scary...)
As I expected Auto ISO with P is pretty much the same as P. The camera would use the low ISO limit and follow the program chart (There is a program chart in the Nikon Df manual, Nikon doesn't include this charte with all cameras though) except that when the shutter speed has to be lower than 1/focal length then it would increase the ISO. In S mode pretty much the same. It use the lower ISO limit and adjust the aperture. When the aperture can not open any more it increases the ISO.
For me I use A mode with Auto ISO because for most of the pictures that I take the shutter speed as long as it's higher than the hand holding speed is rather irrelevant. I do not want my aperture to be any larger than f/4. I would only want to use aperture smaller than f/8 in case I need the extra DOF but in most situation not.