CCTV cameras lenses type & Complete Defination! Difference among 2 8mm,4mm,6mm,8mm,12mm lenses !
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- čas přidán 24. 08. 2024
- CCTV cameras lenses type & Complete Defination! Difference among 2 8mm,4mm,6mm,8mm,12mm lenses !
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Given the condition that the lense of a CCTV camera is the same, the bigger the image sensor is, the wider the Angle of Coverage will be;
Given the condition that the size of the image sensor is the same, the higher the number of focal length of the lens, the narrower the Angle of Coverage will be.
Usually, the size of of image sensor of CCTV camera is 1/3", or 1/2.5"; the focal length of lens is 2.8mm, 3.6mm, 4mm, 6mm, 8mm, 12mm.
With 1/3" of image sensor, 2.8mm focal length will mean about 90° of coverage; 4mm focal length means about 70° coverage, 6mm means about 43.3°coverage, 12mm focal length translates to about 20.6° coverage.
Note that different image resolution will also slightly affect the angle of coverage
CCTV Lens Guide: Choosing a Security Camera Lens
Below is a guide we’ve created for the sole purpose of educating you on the various terms that go along with CCTV or security camera lenses. There are a lot of them, far more than are even described below, but it’s 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.
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. The smaller the focal length, the wider the field of view.
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 person’s face, then you’ll want to consider something with a larger focal length,
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बहोत ही अछि जानकारी
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4mm
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Brother konsa DVR, konsa camera, lena acha hey, mera ghar keliye 8-channel dvr, 4-bullet, and 4-dom camera, rekna chahethy, pls sent model numbers, and company name,🙏
Thanks
Make video on DVR vs NVR. Which one is better for budget setup and proper investment.
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Sir Honeywell pelco axis uniview camera kaha milega.
Hai, vehicle number recognise karne ke leiye konsa konsa brand aur kitna mpx and kitna lens ka use karna hai.plese help karo ispe.
Sir schoolbus ke cctv installation ke bareme batao
Ok
Cau u help me Sir ? i want to change my camra lens
सर आपकी व्हिडिओ काफी अच्ची हे
सर एक सवाल था जब सीसीटीव्ही को झूम करके हम किसिका फोटो लेते हे तो वो पिक्सल मे आती हे तो ऊस फोटो को क्लिअर केसे करे plz बताईये सर आपके जवाब का इंतजार रहेंगा
counter pe currency ache se dikhe ..konsa camera
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20to 23000 ki range 2
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Koi upay nahi hai, DVR hqhi wala chahiye
Please suggest varifocal dome/bullet camera available in market
Ok
Konsa mm lens best rahega
Hi sir am installed securus ip cams 3.6 mm but camera clarity is verry low how to do
Sir meraa bhi yahi question hai ki school bus & school eeco van mai konsa or kese CCTV camera lagana sahi rahega 🤔
Sir by mistake I have bought 12 mm wide camera..how can I decrease it 3.8mm or 70 degrees
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Supar
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Note dekhen kelie kan sa camera lagega
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waise sir kya koi aisa varifocal Lance ata hai jo dvr se km jada kiya ja sakta ho
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Led ka
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Sir Plz suggest Mujhe Wd ki 1 tb Hdd 5400 RPM vendor laga rha hai mene 7200 RPM Hdd bola hai .uske pass 7200 RPM nhi hai. Plz bataye ise change kru ya 5400 RPM hi rahane dena chahiye .ya toshiba lg lena chahiye
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No