Use Viewfinder on iPhone Duo

Viewfinder supports iPhone Duo. Closed, it works as on an iPhone. Open flat, it works as on an iPad. Part-folded, the picture sits on one half and every control on the other.

Part-folded, nothing is laid across the fold. The locked screen, the first screen and the sign-in sheet stand on one half too.

What a part-folded Duo leaves out

With the device part-folded, the camera and the motion sensor can be on different halves, so Viewfinder cannot know which way the camera points:

• The sun overlay shows no heading.
• A shot is tagged with no bearing and no tilt.

Open it flat, or close it, for the compass to come back.

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Updated November 2, 2026