One of the most important considerations when choosing wide angle security cameras for your home or business is know how much area you need to monitor. Each scenario is unique, and therefore, when searching for the best wide angle security camera, its essential to take into account the field of view (angle of vision) of the security cameras. The field of view, also called the viewing angle, of a security camera is the area that the camera can see. The focal length, or the size of the security camera lens, is the main factor that determines the Field of View. Camera with a larger size lens, produce a narrower Field of View and the shorter viewing distance. On the contrary, camera with a smaller size lens, also known as a wide angle security cameras, produce a wider Field of View and longer viewing distance.
The field of view is affected by the lens size, the CMOS image sensor size and the distance the wide angle security cameras is from the scene. The size of the camera lens will affect the viewing angle of what the camera sees. The different sizes of the security camera image sensor chip also affect the viewing angle – the smaller the chip size the narrower the angle of view. The distance from where the wide angle security cameras is mounted from the object also affects what image is recorded.
The type and size of lens that your CCTV camera has plays a main role in determining what image is captured by the camera. That’s why choosing the correct lenses for your security cameras is a very important aspect of designing an effective video surveillance system.
A fixed lens is one where the camera’s focal length is permanently set and cannot be adjusted by the user. This means that a fixed lens doesn’t let you adjust the focal length so the field of view is permanently set, so it is important to select the correct field of view (wide-angle or narrow-angle) for your application. Fixed lens for security cameras are generally less expensive so can be a good option if the layout of an area is not likely to change (such as a room in a house).
These lenses are generally found as 2.8mm, 3.6mm, 6mm, 8mm, 12mm, 16mm etc. As shown on the graph, the larger the size of the lens, the more narrow and zoomed in the field of view is.
A varifocal lens allows users to manually adjust the camera focal length, angle of view and level of zoom. The general size of the lenses are: 2.8-12mm, 3.5-8mm, 6-60, and 5-100mm lens. The larger the aperture number, the more zoomed in the image will appear and the greater detail that can be captured, but you will get less of a field of view, so the image will be narrower. The smaller the aperture number, the wider the view but less detail will be captured. If you need precise adjustment to the angle and field of view for your application, a varifocal lens for security cameras is recommended so that you can adjust the lens to the exact view that you need. Security cameras with varifocal lenses are typically more expensive than the equivalent fixed lens model, but they allow for greater flexibility to optimize the camera picture for your specific needs. Wide angle security cameras, which have lenses that are less than 2.8 or more that open more than 90 degrees, the fish eye security cameras usually places it in the central part of an area so that its angle of view can being 360°, these wide angle security cameras are found in IP security cameras systems.There is a formula that relates these parameters that would be:
Focal length of the lens= Distance between lens and object X Height of the object / Height of the sensor.
Smaller lenses are known as wide angle security cameras lenses, which produce a greater field of view than security cameras with a larger lens. They capture a large area, though objects will appear smaller within the camera image. Ultra wide angle security camera are designed for monitoring large areas.
Among wide angle security cameras is the fisheye or 360 degrees security camera. Ultra wide angle security camera help cover large areas at once, which not only reduces needs to install multiple cameras at one spot but also cuts down installation, maintenance and troubles. However, wide angle security cameras outdoor sacrifice some details to get wider viewing angles, which makes it harder to identify faces or other small details.
If your security cameras application needs, demands you to switch between a narrow and wide field of view, you may want to consider buying a PTZ Security Camera. PTZ Security Cameras have advanced features and a motorized varifocal lens that can be used to change the field of view.
The size of the image sensor and type of image sensor also plays a role in the field of view of wide angle security cameras outdoor. Security cameras image sensors come in a variety of different chip sizes for example, a 1/3″ image sensor produces wider viewing angle than that of 1/4″ sensor image sensor. The different sizes also affect the viewing angle – the smaller the chip size the narrower the angle of view.
Remember: a wider field of view isn’t always better. There are pros and cons to each scenario. If you have further questions or would like to learn more about our wide angle security cameras, ultra wide angle security camera, wide angle wireless security camera, wide angle security cameras outdoor or would like a quote on the best wide angle security camera, please don’t hesitate to contact Dicsan Technology. Our friendly team of experience Security Camera Specialists will answer all your questions and provide you with more information. Take the first step ... contact us today!
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