The Nubia Z60 Ultra is a triple camera phone with three full-frame equivalent optical focal lengths: 18mm, 35mm and 85mm. All ...

Focal length is the optical distance in millimeters between a camera lens and the sensor or film. It determines the height and width of the scene being captured, known as the "field of view." ...

Since an M4/3 sensor is half the size of a full frame sensor, you simply double the focal length of an M4/3. This means that the 9-18mm Mkii is equivalent to an 18-36mm full frame lens ...

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