Why does the rear camera lens of the POCO X7 fog up?

Thank you for your support of the Xiaomi product. The phone adopts an IP68 waterproof rating, which effectively prevents dust intrusion during daily use and can withstand short-term immersion in water under certain conditions without damage. However, this doesn't imply a vacuum-sealed interior, and it cannot completely isolate air.
In certain scenarios, water vapor from the air can enter the phone. Rapid drops in external temperature or significant temperature differences between the interior and exterior of the phone can lead to condensation inside, causing fogging on the lens. This phenomenon is similar to eyeglass lenses fogging up when moving from cold outdoor environments to warm indoor settings during winter. It's a normal physical occurrence, and there's no need to be overly concerned.
To address lens fogging, you can place the phone in a stable environment for some time, allowing the fog to naturally dissipate. Alternatively, you can place the phone in a sealed, dry environment, such as a bag with a desiccant. If lens fogging occurs, it will naturally disappear after a few minutes in a normal room-temperature environment. If you urgently need to use the camera, you can warm the lens with your fingers or palm to facilitate rapid dissipation.