While the Hero4 Black and Silver each have 1/2.3-inch sensors, the Session uses a smaller 1/3.2-inch sensor. This smaller physical size, while helping to explain how the Session is so compact, also means the new camera will probably not be able to deliver the same image quality or low-light performance. GoPro has not revealed what size sensor is used in the Hero+ LCD, though it is believed to be the same 1/3.2-inch type as used in the Session