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TechInsights publishes an article on Galaxy S9+ reverse engineering including its 4 cameras - a dual rear camera, a front camera and an iris recognition sensor:"We are excited to analyze Samsung's new 3-stack ISOCELL Fast 2L3 and we'll be publishing updates as our labs capture more camera details.
Samsung is not first to market with variable mechanical apertures or 3-layer stacked image sensors, however the integration of both elements in the S-series is a bold move to differentiate from other flagship phones.
The S9 wide-angle camera system, which integrates a 2 Gbit LPDDR4 DRAM, offers similar slo-mo video functionality with 0.2 s of video expanded to 6 s of slo-mo captured at 960 fps. Samsung promotes the memory buffer as beneficial to still photography mode where higher speed readout can reduce motion artifacts and facilitate multi-frame noise reduction."
iFixit reverse engineering report publishes nice pictures showing a changing aperture on the wide-angle rear camera:
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