|
The following chart displays the comparision of CCTV lens
with the regular 135mm film camera lens.
|
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
|
CCTV Visual Lens Comparison Chart 
