Quote Originally Posted by Horoscope Fish View Post
Are you trying to change the Auto-ISO setting with the large Mode Dial set to either P, S, A, or M? Because Auto-ISO sensitivity options can only be changed in those modes.

See pages 102 -104 of the D7200 User Manual for information on setting and adjusting Auto-ISO options.
Yes, the OP is in Aperture Priority.

› See More: Another Mini ISO Tutorial