Sony DSC-HX90V Manual page 77

When you rotate the control ring, the focus distance is displayed on the screen.
3. Press the shutter button fully down to take the picture.
Note
When you use the viewfinder, adjust the diopter level to obtain the correct focus on the
viewfinder.
If you re-select the [Focus Mode], any focus distance that you set manually will be
canceled.
[61] How to Use
Direct manual focus (DMF)
You can make fine adjustments manually after the focus is locked.
You can quickly focus on a subject rather than using the manual focus from the beginning.
This is convenient in cases such as macro shooting.
1. MENU →
2. Press the shutter button halfway down to focus automatically.
3. Keep the shutter button halfway down, rotate the control ring to achieve a sharper
focus.
Using shooting functions
(Camera Settings) → [Focus Mode] → [DMF].
Adjusting the focus