4/19/2021 0 Comments Difference In Camera Lens Sizes
The larger the image sensor, the larger the field of view the camera has.There are a lot of them, far more than are even described below, but its important because the lens is such a crucial part of your video surveillance system.Knowing which lens to choose can save you time, money, and will increase the likelihood of capturing exactly what you intend.
And as always, if you need a security camera lens and dont feel like reading below, just give us a call and well be glad to help 1-877-926-2288 If you already know the specs of a particular lens, try it out on our lens calculator to discover the field of view the lens is capable of capturing. Focal Length (mm) The focal length (measured in mm) of a lens determines how far the camera can see. The most common focal length on security cameras is 3.6mm, which will allow for roughly a 72 degree field of view (FOV described below). This particular focal length works well for residential or small office surveillance applications. If you can only learn one thing about security camera lenses, you should learn that the bigger the focal length, the farther away it can focus. CCTV Lens Focal Length Field of View (FOV) Field of View is the area, in width, that the lens will allow you to see. If you hear the term wide angle then it will have a smaller lens, like 2.8mm. This means just what it sounds like, the picture will be wider. With a smaller focal length details are also more difficult to see. If you are capturing video in a normal sized room, maybe 20x20ft, then a wide angle lens will work just fine. If you need to capture a persons face, then youll want to consider something with a larger focal length, like 16mm for example. Varifocal Monofocal lenses or fixed lenses can only focus at a specific distance mono one one length They will have one focal length, like 1 6mm or 3.6mm. They are generally cheaper than Varifocal lenses, which will allow you to adjust the focal length manually. Varifocal lenses will usually have a range, like 2.5-6mm or 5-50mm. Zoom lenses are similar to varifocal, except the focal length will adjust electronically, thus they are generally more expensive. Zoom Lenses Zoom CCTV lenses are bit more expensive because, well, theyre better. They can automatically adjust focus to increase the definition on a given object. Manual vs. Auto Iris This is very similar to the choice between Monofocal and Varifocal, in that one is fixed and the other varies, and thus, is more expensive. The iris has to do with how much light is allowed to filter in through the lens. A manual or fixed iris lens is one youd use if you are in an area where the lighting does not change, like an office. An auto iris lens will automatically adjust for light variations. Youll probably need an auto-iris lens for outdoor surveillance. Also important for various lighting conditions, is the cameras LUX rating. CameraImage format Here, were referring to the CCD image sensor of the camera. Youll notice that most CCTV cameras list either 23, 12, 13, or 14 for their CCD image sensor.
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