1. Classification by lens type
(1) Wide-angle lens: the 2mp camera observation angle is much larger than 90 degrees, and is usually used in places with large observation surfaces such as elevator cars and places
(2) Standard lens: the viewing direction is about 30 degrees, usually used in places such as sidewalks and groups around
(3) Telephoto lens: the visual position is within 20 levels, and the main time is between tens of millimeters to hundreds of millimeters, which is used for ultra-long distance inspection
(4) Zoom lens: The focal length range of the camera lens is adjustable, from wide-angle to telephoto, with a wide viewing angle range
(5) Pinhole lens: for covert tracking.
2. Classification by shape
(1) Bolt: cheap, lacks zoom and rotation functions, can only track a fixed range from one angle, and has poor concealment
(2) Hemispherical camera: It has a specific concealment, and at the same time, it has a small and exquisite appearance, and is hung on the ceiling to make up for the lack of the bolt part.
(3) High-speed dome camera: digital camera + PTZ all-in-one machine, with functions such as fast monitoring, 360-degree education horizontal rotation, no tracking blind spot, and privacy area shielding.
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