Lens Calculator

Security Cam Depot
Field of View Calculator
 For 1/3 Inch CCTV
 Cameras
 



Enter the distance to the target object, and focal length of the lens.  Click "Calculate" to see the field of view you can expect with that lens. 
"H" is the Horizontal or the Width of the picture in feet. 
"V" is the Vertical or the Height of the picture in feet.
Field of View Calculator Instructions:
 
Distance to Target : ft
Lens Size : mm
Field of view (H x V) ft x ft
Calculate Clear

Lens Field Of View Chart

The numbers listed below should be considered accurate to within + / - 3° and therefore a few feet as well. This chart is intended as an approximate guideline to help select the appropriate lens.

Lens Focal
Length
Distance between video camera and the video subject area
5' away
10' away
15' away
25' away
50' away
100' away
mm
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
Horz area
Vert area
2.45
17.3'
13'
34.6'
26'
51.9'
39'
86.5'
65'
173'
130'
346'
260'
2.80
14'
10.5'
28'
21'
42'
31.5'
70'
52.5'
140'
105'
280'
210'
2.97
12.3'
9.6'
24.6'
19.2'
36.9'
28.8'
61.5'
48'
123'
96'
246'
192'
3.60
7.5'
5.7'
15'
11.4'
22.5'
17.1'
37.5'
28.5'
75'
57'
150'
114'
3.70
7.3'
5.5'
14.6'
11'
21.9'
16.5'
36.5'
27.5'
73'
55'
146'
110'
4.0
6.6'
5'
13.2'
10'
19.8'
15'
33'
25'
66'
50'
132'
100'
4.30
6.1'
4.6'
12.2'
9.2'
18.3'
13.8'
30.5'
23'
61'
46'
122'
92'
5.0
4.7'
3.5'
9.4'
7'
14.1'
10.5'
23.5'
17.5'
47'
35'
94'
70'
6.0
3.8'
2.9'
7.6'
5.8'
11.4'
8.7'
19'
14.5'
38'
29'
76'
58'
8.0
2.9'
2.2'
5.8'
4.4'
8.7'
6.6'
14.5'
11'
29'
22'
58'
44'
12.0
1.9'
1.5'
3.8'
2.8'
5.7'
4.5'
9.5'
7.5'
19'
15'
38'
28'
16.0
1.4'
1.1'
2.8'
2.2'
4.2'
3.3'
7'
5.5'
14'
11'
28'
22'
25.0
1'
0.7'
2'
1.4'
3'
2.1'
5'
3.5'
10'
7'
20'
14'
50.0
0.4'
0.3'
0.8'
0.6'
1.2'
0.9'
2'
1.5'
4'
3'
8'
6'

 

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