Direct Manual Focus (Dmf) - Sony ILCA-99M2 Instruction Manual

Direct manual focus (DMF)

You can make fine adjustments manually after performing auto focusing,
letting you focus on a subject more quickly than when using the manual
focus from the beginning. This is convenient in situations such as macro
shooting.
1
MENU 
2
Press the shutter button halfway down to focus automatically.
3
Keep the shutter button
pressed halfway down, and
then rotate the focusing ring
to achieve a sharper focus.
4
Press the shutter button fully down to shoot an image.
GB
44
(Camera Settings1)  [Focus Mode]  [DMF].