CCTV Camera Technology and Optics Flashcards
6 cards from real CCTV practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CCTV Camera Technology and Optics flashcards as text
What does 'resolution' measure in the context of CCTV cameras?
Answer: The number of pixels used to form an image
Resolution refers to the number of pixels (horizontal × vertical) that make up a captured image, directly affecting image clarity and detail.
What is the main benefit of using a motorized zoom lens in a CCTV system?
Answer: It allows remote focal length adjustment without physical access to the camera
Motorized zoom lenses can be adjusted remotely via the VMS or control system, eliminating the need for physical access to the camera after installation.
Which camera housing type is specifically designed to protect cameras from vandalism in public areas?
Answer: Vandal-resistant dome housing (IK10-rated)
Vandal-resistant dome cameras with IK10 rating are built to withstand physical attacks, making them suitable for high-risk public environments.
What does SNR (Signal-to-Noise Ratio) measure in CCTV cameras?
Answer: The ratio of useful video signal to background electronic noise
SNR measures the ratio of the desired video signal to unwanted electronic noise; a higher SNR (measured in dB) produces cleaner, clearer images.
In CCTV, what is 'depth of field'?
Answer: The range of distances within a scene that appear acceptably sharp
Depth of field is the range of distances from the camera within which objects in the scene appear in acceptable focus.
What is a key characteristic of a 'pinhole' camera lens used in CCTV?
Answer: Very small front aperture allowing discreet concealed installation
Pinhole lenses have a tiny front opening (as small as 1mm) that can be concealed behind a small hole, making them ideal for covert surveillance installations.