Zoom
When a zoom lens is mounted, you can enlarge images by turning the zoom ring of the lens.
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Turn the zoom ring of the zoom lens to enlarge subjects.
About other [Zoom] functions than the optical zoom
When you set [Zoom Setting] to something other than [Optical zoom only], you can use other zoom functions than the optical zoom.
MENU → 
(Camera Settings) → [Zoom] → desired value.