Zoom lens principle

The principle of optical zoom is that different positions of the lens, focus and the object to be photographed produce different changes. When the position of the lens changes, the focal length of the shot will also change. At present, due to the limitation of fuselage thickness, the optical zoom function of mobile phones is limited, and digital zoom and hybrid zoom are generally used. Digital zoom refers to intercepting a certain area on the basis of the range of lens photosensitive elements, and then continuously enlarging the pixel area of the intercepted area to achieve the effect of enlarging the mobile phone picture. At present, Huawei P30PRO can achieve 50x digital zoom. Huawei P30PRO camera parameter introduction: Huawei P30pro has five cameras, four in the rear and one in the front. The rear camera is a 40-megapixel super-sensitive lens+20-megapixel super-wide-angle lens+8-megapixel telephoto lens+Huawei time-of-flight (ToF) camera. Support 4K HD video, macro, super wide-angle mode, 50x digital zoom, night vision mode and other shooting. The photos taken later can support up to 7296×5472 pixels. The front camera has 32 million pixels and supports portrait mode, panoramic mode, fun AR, time-lapse photography and other functions. Huawei P30PRO has the function of an underwater camera, but it needs to buy a P30Pro diving protective case.