What is the most common CCTV lens size?

The 2.8mm lens is the most popular for indoor dome cameras — it provides ~110° wide-angle coverage ideal for rooms and corridors. For outdoor use, 4mm is most common, offering a good balance of coverage and detail.

Can I change the lens on my CCTV camera?

It depends on the camera. Box cameras and some bullet cameras have interchangeable C/CS-mount lenses. Most dome and turret cameras have fixed or motorized varifocal lenses that cannot be swapped. Check your camera's mount type before purchasing a lens.

Chon ong kinh CCTV phu hop: huong dan ve tieu cu

Hieu ve tieu cu

Tieu cu (do bang mm) xac dinh goc nhin cua ong kinh. Tieu cu ngan hon (2,8-4mm) la goc rong va hien thi khu vuc lon hon. Tieu cu dai hon (25-50mm) la ong kinh tele, phong to cac vat the xa.

Pham vi tieu cu:

2,8-3,6mm: Goc rong, FOV 80-110 do
4-8mm: Tieu chuan, FOV 50-80 do
12-25mm: Tele, FOV 15-50 do
35-50mm: Tele manh, FOV duoi 15 do

Phan loai ong kinh

Ong kinh tieu cu co dinh

Tieu cu co dinh va khong the thay doi. Re hon, don gian hon, nhung kem linh hoat. Pho bien nhat trong CCTV.

Ong kinh varifocal

Tieu cu co the dieu chinh (vd: 2,8-12mm). Dat hon, nhung cho phep tinh chinh chinh xac sau khi lap dat.

Zoom dong co

Tieu cu dieu chinh bang dien. Dat nhat, nhung cho phep dieu chinh tu xa tu trung tam giam sat.

PTZ (Xoay-Nghiêng-Thu phóng)

Camera co the xoay, nghieng va phong to. Dung de giam sat chu dong, khong phai giam sat co dinh thong thuong.

Ghep noi kich thuoc cam bien

Ong kinh duoc thiet ke cho kich thuoc cam bien cu the. Su dung ong kinh sai cho cam bien sai co the gay ra hien tuong toi goc hoac phu song khong du.

Kich thuoc cam bien	Ong kinh dien hinh	Ung dung
1/3 inch	2.8-50mm	2,8-50mm
1/2 inch	3.6-50mm	Giam sat tieu chuan
2/3 inch	4-100mm	3,6-50mm

Su dung chung

He thong chuyen dung

Su dung ong kinh goc rong 2,8-3,6mm. Phu song khong gian lon nhung voi chi tiet thap hon. Tot cho phat hien chuyen dong tren khu vuc rong.

Phu song khu vuc rong

Su dung ong kinh goc rong 2,8-3,6mm. Phu song khong gian lon nhung voi chi tiet thap hon. Tot cho phat hien chuyen dong tren khu vuc rong.

Nhan dien khuon mat

Su dung ong kinh 4-6mm lap cach khuon mat 2-3 met. Dam bao chi tiet tot ma khong qua hep khung hinh.

Ghi nhan bien so xe

Su dung ong kinh tele 12-25mm. Dat cach bai dau xe 15-30 met de ghi nhan bien so ro rang.

Chon ong kinh CCTV phu hop

Muc luc