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MKBHD has a good explanation (starts at 2:43): https://www.youtube.com/watch?v=J83sZrz9XTc

Basically this is the first(?) camera phone with adjustable aperture, albeit it only has 2 presets.

Buuuut probably the first flagshippy camera with a variable aperture.

I didn't realize small camera's didn't have an adjustable aperture typically, that makes more sense now.