The rear camera aperture of the Redmi Note 14 Pro+ 5G is f/1.65, which is quite large. More light reaches the sensor, which helps in low-light conditions, reducing noise and improving image clarity. The larger aperture can create a nice bokeh (blurred background) effect, making subjects stand out more against soft backgrounds.
When taking close-up shots, the camera's focus tends to be on the subject in the center of the frame, while objects in the foreground and background, including the corners, fall out of focus and appear blurred. This is a normal phenomenon in photography. To minimize this effect, try to focus on the subject at the center.