The rear camera has an f / 2.0 lens and, unusually, its equivalent
focal length seems to be slightly greater than 35 mm, so it's not hugely wide - angle.
What we're getting here is a wide - angle «1X» camera and a «2X» zoom camera; it
seems OnePlus incorrectly reports the
focal lengths for these cameras, but we can confirm the difference between each camera's field of view is 2x.