In CCTV terminology, what does "back focus" refer to?

In CCTV terminology, "back focus" specifically refers to the adjustment of the distance between the lens and the imaging sensor to ensure that the captured image is in sharp focus. This adjustment is critical in ensuring that the lens is properly aligned with the sensor, allowing for clear and accurate image quality. When the back focus is set correctly, it allows the camera to properly capture details at various distances, which is essential for surveillance and monitoring purposes.

The other options do not relate directly to the definition of back focus. While zooming in on a subject is important for certain camera functionalities, it does not pertain to the focus mechanism itself. Resolution quality is a separate concept that deals with the clarity and detail of the image captured, which is influenced by factors other than back focus. Lastly, the placement of the camera in relation to the wall affects the field of view and the angle of capture but does not involve the direct mechanical or optical adjustments associated with back focus.