|
CCTV lens
|
135mm lens
|
|
|
|
Focal Length
|
Angle
|
Angle
|
Focal Length
|
|
|
|
2.5mm
|
120°
|
114°
|
14mm
|
|
|
|
3.6mm
|
92°
|
94°
|
20mm
|
|
|
|
4.3mm
|
78°
|
75°
|
28mm
|
|
|
|
6.0mm
|
53°
|
51°
|
45mm
Standard lens for 135mm camera
Regular angle of our eyes vision
|
|
|
|
12mm
|
25°
|
24°
|
100mm
|
|
|
|
25mm
|
18°
|
18°
|
135mm
|
|
|
|
CCTV Technical Lens Comparison Chart
|
|
Indicates total
viewable area (WxH) at a given distance based on focal length used
|
|
Focal Length
|
5' (WxH)
|
10' (WxH)
|
20' (WxH)
|
40' (WxH)
|
50' (WxH)
|
100' (WxH)
|
|
2.5 mm
|
9.4x7.1
|
19x14
|
38x28
|
75x57
|
94x71
|
188x142
|
|
2.9 mm
|
8.6x6.4
|
17x13
|
34x26
|
69x51
|
86x64
|
171x129
|
|
3.6 mm
|
6.9x5.1
|
14x10
|
27x21
|
55x41
|
69x51
|
137x103
|
|
4.0 mm
|
6.0x4.5
|
12x9
|
24x18
|
48x36
|
60x45
|
120x90
|
|
4.3 mm
|
5.7x4.3
|
11x8.6
|
23x17
|
46x34
|
57x43
|
114x86
|
|
5.5 mm
|
4.5x3.4
|
9x6.8
|
18x14
|
36x27
|
45x34
|
90x68
|
|
6.0 mm
|
2.0x1.5
|
4x3
|
8x6
|
16x12
|
20x15
|
40x30
|
|
8.0 mm
|
1.5x1.1
|
3x2.3
|
6x4.5
|
12x9
|
15x11
|
30x22
|
|
12.0 mm
|
1.0x0.7
|
2x1.4
|
3.8x3
|
7.7x6
|
9.6x7
|
19x14
|
Use your 35mm camera and this chart to help make your
lens decision.
|
35mm to CCTV Focal Length Conversion Chart
|
|
35 mm
|
1/4"
|
1/3"
|
1/2"
|
2/3"
|
1"
|
Angle
|
|
10
|
0.9
|
1.4
|
1.8
|
2.5
|
3.7
|
120.6
|
|
35
|
3.2
|
4.8
|
6.4
|
8.8
|
12.8
|
53.2
|
|
60
|
5.5
|
8.2
|
11.0
|
15.1
|
22
|
32.6
|
|
85
|
7.7
|
11.6
|
15.6
|
21.3
|
31.1
|
23.3
|
|
110
|
10.0
|
15.1
|
20.1
|
27.6
|
40.3
|
18.1
|
|
135
|
12.3
|
18.5
|
24.7
|
33.9
|
49.4
|
14.8
|
|
160
|
14.6
|
21.9
|
29.3
|
40.2
|
58.6
|
12.5
|
|
185
|
16.8
|
25.3
|
33.9
|
46.4
|
67.7
|
10.8
|
|
210
|
19.1
|
28.8
|
38.4
|
52.7
|
76.9
|
9.5
|
|
235
|
21.4
|
32.2
|
43.0
|
59.0
|
86.0
|
8.5
|
|
260
|
23.7
|
35.6
|
47.6
|
65.3
|
95.2
|
7.7
|
CCTV focal length numbers shown converted from
a 35mm camera zoom lens.