Ricoh Lens A16 - Manual (Page 35)

[Shutter Button Confirmation]
When [ADJ./DIRECT] is set, pressing the shutter release button halfway
down will finalize settings in ADJ. mode and on the DIRECT screen, and you
will be able to shoot pictures. When [ADJ.] is set, the ADJ. mode settings
will be finalized, enabling you to shoot pictures. When [DIRECT] is set, the
DIRECT screen settings will be finalized, enabling you to shoot pictures.
After you finish shooting pictures, the system will return to the Monitoring
screen.
[Set Fn1/Fn2 Buttons]
[Enlrg Display], [Focus Assist], [Aspect Ratio], and [Dynamic Range
Compensation] functions are added.