Sony Xperia XZ2A Manual page 136

Photo Viewfinder appears.
If confirmation appears, follow onscreen instructions.
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Alternatively, Long Press Camera Key for one second or more, or Press Power Key twice, or in
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Lock Screen Flick
If there is no operation on Viewfinder, Camera operation ends.
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Swipe (Flick) Photo Viewfinder to switch to Video Viewfinder
Swipe (Flick) up or down in a landscape viewfinder, or left or right in a portrait viewfinder.
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To use Camera app, select an application in CAMERA APPS.
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xperia-xz2a_07_Camera.docx
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to quick-activate Camera.