[Aperture Drive in AF] (still image) in the menu can be used in camera system software of Ver. 2.00 or later.
With Ver.4.00 or later of the camera system software you can register an aperture value of F1.2 as a custom hold setting when the exposure step is set to 0.3 stop basis.
With Ver.4.00 or later of the camera system software you can set an aperture value of F1.2 or F1.3 from Imaging Edge Mobile and Imaging Edge Desktop (Remote).