Sony ILCE-9M2 Operating Instructions - Page 66

Aperture Drive in AF Changes the aperture drive system to prioritize the auto-focusing tracking performance or to prioritize silence. MENU  (Camera Settings 1)  [Aperture Drive in AF]  desired setting. Focus Priority: Changes the aperture drive system to prioritize autofocusing performance. Standard: Uses the standard aperture drive system. Silent Priority: Changes the aperture drive system to prioritize silence so that the sound from the aperture drive is quieter than in [Standard]. Note ••When [Focus Priority] is selected, sound from the aperture drive may be audible, or the aperture effect may not be visible on the monitor. Also, the continuous shooting speed may become slower or the screen may flicker. To avoid these phenomena, change the setting to [Standard]. ••When [Silent Priority] is selected, the focusing speed may become slower, and it may be more difficult to focus on a subject. ••Focus during continuous shooting is locked to the setting of the first shot when the parameter for [Aperture Drive in AF] is set to [Standard] or [Silent Priority], and the F-value is greater than F16. ••The effect may differ depending on the lens you use and the shooting conditions. GB 66