The UltraPixel shooter around back is, for all intents and purposes, the same exact camera as last year. The sensor is the same four megapixel backside-illuminated one with giant 2µm pixels, but there's a new imaging processor attached and HTC has ditched the optical image stabilization tech. But, it's also added a second camera to the back in what it's calling a Duo Camera array. Truth be told, the second "camera" isn't actually a camera in the traditional sense, it's a depth sensor. It allows the One to perform all sorts of neat tricks especially in post processing, such as blurring backgrounds or changing the focus point like a Lytro.