Oppo recently decided not to announce a new phone, but a new camera technology called 5X Dual Camera Zoom. And it’s kind of awesome they came up with the Oppo sideways camera setup for the phone.

Oppo has taken the biggest challenge of smartphone cameras, which is their inability to provide optical zoom while keeping the device to a slim profile, and thought why not try it sideways. The new system has one traditional camera sensor and one that’s been pivoted 90 degrees so that it doesn’t face the back of the phone but looks to the left side instead. Then there’s a series of lenses to focus the light onto that sensor, which arrives into the phone and is pointed at the sensor via a mirror, or prism. Basically, it works just like a periscope.

http://syberkart.com/blog/oppo-sideways-camera/