Thank you for your support of Xiaomi products. The Redmi Note 13 Pro is a high-performance smartphone built on the latest flagship platform. It achieves an IP54 dust and water resistance rating, providing splash protection for regular daily activities. 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 will 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 let the phone sit 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.