The Galaxy S9 and S9+ may look a lot like their Galaxy S8 predecessors at first glance, but Samsung will be the first to tell you that their cameras have had a big upgrade for 2018. With Dual Pixel technology adding twin apertures, a new Super Slow-mo mode, AR Emojis, and the arrival of twin cameras on the S9+, there’s a lot here for mobile photographers to unpack. Read on for the five things you really need to know about the Galaxy S9 and S9+ cameras.

Why dual-aperture is important

Why does the aperture matter? It’s what decides how much light makes it through to the sensor: the larger the hole, the more light gets through. The obvious assumption would be that “bigger aperture = better” and, certainly, we’ve seen a progression of smartphone camera lenses moving toward larger and larger apertures – measured as f-numbers or f-stops – over the past few years. A little confusingly, a smaller f-stop number actually means the camera’s sensor is getting more light than a larger f-stop.
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