Len Chart | Len tool for calulating focal lenghts of CCTV Security Camera Lenses

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Cortex AI Professional Security Surveillance

Lens Focal Length

Distance between camera and monitored zone

5-feet

10-feet

Millimeters

2.45
2.80
2.97
3.60
3.70
4.0
4.30
5.0
6.0
8.0
12.0
16.0
25.0
50.0

Horz area

17.3'
14'
12.3'
7.5'
7.3'
6.6'
6.1'
4.7'
3.8'
2.9'
1.9'
1.4'
1'
0.4'

Vert area

13'
10.5'
9.6'
5.7'
5.5'
5'
4.6'
3.5'
2.9'
2.2'
1.5'
1.1'
0.7'
0.3'

Horz area

34.6'
28'
24.6'
15'
14.6'
13.2'
12.2'
9.4'
7.6'
5.8'
3.8'
2.8'
2'
0.8'

Vert area

26'
21'
19.2'
11.4'
11'
10
9.2'
7'
5.8'
4.4'
2.8'
2.2'
1.4'
0.6'

15-feet

25-feet

Millimeters

2.45
2.80
2.97
3.60
3.70
4.0
4.30
5.0
6.0
8.0
12.0
16.0
25.0
50.0

Horz area

51'
42'
36.9'
22.5'
21.9'
19.8'
18.3'
14.1'
11.4'
8.7'
5.7'
4.2'
3'
1.2'

Vert area

39'
31.5'
28.8'
17.1'
16.5'
15'
13.8'
10.5'
8.7'
6.6'
4.5'
3.3'
2.1'
0.9'

Horz area

86.5'
70'
61.5'
37.5'
36.5'
33'
30.5'
23.5'
19'
14.5'
9.5'
7'
5'
2'

Vert area

65'
52.5'
48'
28.5'
27.5'
25
23'
17.5'
14.5'
11'
7.5'
5.5'
3.5'
1.5'

50-feet

100-feet

Millimeters

2.45
2.80
2.97
3.60
3.70
4.0
4.30
5.0
6.0
8.0
12.0
16.0
25.0
50.0

Horz area

173'
140'
123'
75'
73'
66'
61'
47'
38'
29'
19'
14'
10'
4'

Vert area

130'
105'
96'
57'
55'
50'
46'
35'
29'
22'
15'
11'
7'
3'

Horz area

346'
280'
246'
150'
146'
132'
122'
94'
76'
58'
38'
28'
20'
8'

Vert area

260'
210'
192'
114'
110'
100
92'
70'
58'
44'
28'
22'
14'
6'

Lens Focal Length

Distance between camera and monitored zone

5-feet

10-feet

15-feet

25-feet

50-feet

100-feet

Millimeters

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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