The focal plane is the specific area behind a camera lens where light converges to form a sharply focused image. This is the surface on which the camera's film or digital sensor (CCD or CMOS) is positioned to capture the image accurately.
Precise alignment of the focal plane is essential for achieving sharp photographs, as any deviation can result in blurred or out-of-focus images. Understanding the focal plane is especially important in technical, studio, and large-format photography, where depth of field and focus accuracy are critical for high-quality results.