CCTV CCTV Camera Technology and Optics

Question 1

What does the term 'focal length' refer to in CCTV camera lenses?

Accepted Answer

The distance from the lens to the image sensor where parallel rays converge

Answer

The maximum distance a camera can detect motion

Answer

The width of the camera's housing

Answer

The power consumption of the camera module

Question 2

Which camera type is best suited for a wide-area indoor space requiring a 360-degree view?

Accepted Answer

Fisheye camera

Answer

Bullet camera

Answer

PTZ camera

Answer

Box camera

Question 3

What is the primary advantage of a varifocal lens over a fixed lens in CCTV?

Accepted Answer

Adjustable focal length without disassembly

Answer

Lower cost

Answer

Higher resolution output

Answer

Wider aperture range

Question 4

What does 'WDR' stand for in CCTV camera specifications?

Accepted Answer

Wide Dynamic Range

Answer

Wireless Data Recording

Answer

Wide Depth Resolution

Answer

White Definition Rate

Question 5

Which sensor type is commonly used in modern IP cameras for converting light into electrical signals?

Accepted Answer

CMOS

Answer

CRT

Answer

LCD

Answer

LED

Question 6

What does a lower f-number (aperture) on a CCTV camera lens indicate?

Accepted Answer

Larger aperture allowing more light

Answer

Narrower field of view

Answer

Less light entering the lens

Answer

Higher focal length