Which statement about C-Mount CCTV cameras is true?

Which statement about C-Mount CCTV cameras is true?

• A. They use fixed lenses with a single focal length
• B. They are only for indoor use
• C. They are digital-only with no analog options
• D. They use detachable lenses to allow different focal lengths

Answer: (D)

The main concept here is that C-Mount cameras are defined by their detachable lenses, which use a standardized screw-type mount. Because the lens is removable, you can swap in lenses with different focal lengths, giving you control over the field of view without changing the camera body. This flexibility is what makes C-Mount cameras versatile: you can use a wide-angle lens for a large area or a telephoto lens for distant targets, depending on the surveillance need. The other statements miss this key point: fixed lenses would lock you into one view, outdoor use is possible with appropriate housing rather than being restricted to indoors, and C-Mount cameras have existed in both analog and digital formats, so they are not limited to digital-only with no analog options.

The main concept here is that C-Mount cameras are defined by their detachable lenses, which use a standardized screw-type mount. Because the lens is removable, you can swap in lenses with different focal lengths, giving you control over the field of view without changing the camera body. This flexibility is what makes C-Mount cameras versatile: you can use a wide-angle lens for a large area or a telephoto lens for distant targets, depending on the surveillance need. The other statements miss this key point: fixed lenses would lock you into one view, outdoor use is possible with appropriate housing rather than being restricted to indoors, and C-Mount cameras have existed in both analog and digital formats, so they are not limited to digital-only with no analog options.