http://www.techradar.com/news/heres-why-the-galaxy-note-8-is-samsungs-first-handset-with-a-dual-camera-setup

The rear camera is one of the most hotly-contested (and ruthlessly-promoted) features in today’s premium smartphones — a fact driven home by the constant jousting for top spot in DxOMark’s renowned best mobile camera rankings. The competition has become so close that, even when vendors like Apple, Google, Samsung or Sony launch a new phone that takes out first place, that ‘winner’ often has to share the lead position — and ultimately, almost all of them have their short reigns overthrown within a few months, or less.

Over the last couple of years, dual rear cameras have slowly become the norm for flagship smartphones, but this year’s Galaxy S8 and S8 Plus bucked that trend by sticking with the same 12-megapixel, single-sensor camera spec that was used in their 2016 predecessors, with just a few enhancements to boost overall picture quality and performance. That's made the new Note 8 the first device from Samsung that includes a dual-camera array, which — as always — brings with it a raft of much-touted new photography features.