When I read the exif data that ARKit what is SubjectArea? Why does LensSpecification repeat the 4.2 (the focal I think) and the 1.6 (the aperture I think)?

"SubjectArea": ( 2013, 1511, 2116, 1270 )
"LensSpecification": ( 4.2, 4.2, 1.6, 1.6 )

The subject area is defined as rectangle with center coordinate and its dimensions. In this case, the center is at (2013, 1511) with rectangle dimensions 2116 x 1270.

For more details, you may refer to Exif standard tags.

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