Security Cameras - Lens Chart

Lines of Resolution: A Surveillance Camera's performance is based on the number of horizontal lines that the chip in the camera provides. The lines of resolution determines the quality of the video the camera can produce. The higher the number of lines of resolution, the better the video quality.

Performance

Color

B/W

Standard

480 Lines

420 Lines

Medium

540 Lines

480 Lines

High

700 Lines

700 Lines


Lens: The lens determines the field of view the camera provides. Lenses range from 2.8mm to 18mm on an average. The larger the lens size the farther it will view. The draw back to a 12mm or 18mm lens is that the horizontal view narrows to as little as 15 feet.


Lens

Distance

Width

2.8 mm

10 feet

15 feet

3.6mm

30 feet

30 feet

6 mm

60 feet

20 feet


*Many of our customers require a standard fixed wide angle 3.6mm lens. They are designed to be installed in a corner, provide a 90 degree field of view, and provide effective surveillance in a 30 x 30 foot area. If you need to adjust the angle and are not sure when viewing a cash register or looking down aisles, we recommend a vari-focal lens which you can adjust manually based on the angle and distance of the camera to the subject. For example, with a cash register we recommend a 4-8mm vari-focal lens so you can manually adjust and capture the money, hands, and register close up. When in doubt, go with a vari-focal adjustable lens.


Lux and low lighting chart
Condition Illumination Details
(FTCD) (LUX)
Sunlight
Full Daylight
Overcast Day
Very Dark Day
Twilight
Deep Twilight
10,000
1,000
100
10
1
.1
107,527
10,752.7
1,075.3
107.53
10.75
1.08
Daylight
Range
Full Moon
Quarter Moon
Starlight
Overcast Night
.01
.001
.0001
.00001
.108
.0108
.0011
.0001
Low Light
Level Range

During the day the amount of illumination reaching a scene depends on the time of day and atmospheric conditions. Direct sunlight produces the highest-contrast scene, allowing maximum identification of objects. On a cloudy or overcast day, less light is received by the objects in the scene, resulting in less contrast. To produce an optimum camera picture under the wide variation in light level (such as occurs when the sun is obscured by clouds), an automatic-iris camera system is required. Typically, scene illumination measured in foot-candles (ftcd) can vary over a range of 10,000 to 1 (or more), which exceeds the operating range of most cameras for producing good quality video images. The chart above summarizes the light levels occurring under daylight and these low light level conditions. The equivalent metric measure of light level (lux) compared with the English (ftcd) is given.

2.5mm Lens

120

3.6mm Lens

90

4.3mm Lens

78

6.0mm Lens

53

12mm Lens

25

25mm Lens

18

lens
size
Field of View (in ft.)
5 ft
away
10 ft
away
15 ft
away
25 ft
away
50 ft
away
100 ft
away
mm
w
h
w
h
w
h
w
h
w
h
w
h
3.6 7.5 5.2 15.1 10.4 22.6 15.6 37.7 26.1 75.4 52.1 151 104
6.0 3.8 2.9 7.7 5.7 11.5 8.6 19.2 14.4 38.4 28.7 77 57
8.0 2.9 2.1 5.7 4.3 8.6 6.4 14.4 10.7 28.7 21.3 57 43
12.0 1.9 1.5 3.9 3.0 5.8 4.5 9.7 7.5 19.4 14.9 39 30


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