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LENSA - CCTV LENS TABLE


Lens Focal Length
www.allthings.com.au/

Lens Focal Length may be calculated after determining DISTANCE to SCENE (DS) from CCTV Camera and the WIDTH of SCENE (WS) required at that distance.

Focal Length of Lens = (DISTANCE to SCENE × 4.8) ÷ (WIDTH of SCENE).
All measurements in mm [equation for 1/3" Sensor, 4.8 mm wide × 3.6 mm high]

Focal Length of Lens = (DISTANCE to SCENE × 3.6) ÷ (WIDTH of SCENE).
All measurements in mm [equation for 1/4" Sensor, 3.6 mm wide × 2.7 mm high]

Focal Length of Lens = (DISTANCE to SCENE × 6.4) ÷ (WIDTH of SCENE).
All measurements in mm [equation for 1/2" Sensor, 6.4 mm wide × 4.8 mm high]

For example if DS = 1500mm, WS = 2000mm, Sensor = 1/3" equation is:
(1500 × 4.8) ÷ 2000 = 3.6.

A 3.6 mm focal length lens will provide an on-screen image of a scene 2000 mm wide at a camera distance of 1500 mm.
In practice results may vary ± ~15% due to component tolerances, variations in image sensor dimensions and monitor over-scan.

Other transpositions of equation:

To Find:

Width of Scene = (DISTANCE to SCENE × 4.8) ÷ (Focal Length of Lens).
All measurements in mm [equation for 1/3" Sensor, 4.8 mm wide × 3.6 mm high]

Width of Scene = (DISTANCE to SCENE × 3.6) ÷ (Focal Length of Lens).
All measurements in mm [equation for 1/4" Sensor, 3.6 mm wide × 2.7 mm high]

Width of Scene = (DISTANCE to SCENE × 6.4) ÷ (Focal Length of Lens).
All measurements in mm [equation for 1/2" Sensor, 6.4 mm wide × 4.8 mm high]


 

To Find:

Distance to Scene = (Width of Scene × Focal Length of Lens) ÷ (4.8).
All measurements in mm [equation for 1/3" Sensor, 4.8 mm wide × 3.6 mm high]

Distance to Scene = (Width of Scene × Focal Length of Lens) ÷ (3.6).
All measurements in mm [equation for 1/4" Sensor, 3.6 mm wide × 2.7 mm high]

Distance to Scene = (Width of Scene × Focal Length of Lens) ÷ (6.4).
All measurements in mm [equation for 1/2" Sensor, 6.4 mm wide × 4.8 mm high]

Lens Selection Guide for CCTV Cameras with 1/3 Inch Image Sensor
www.cctvjakarta.com - 081316068899 - 02133098899

Lens focal length: mm Horizontal angle-of-view degrees Scene width in mm @ 1 metre Scene width in mm @ 3 metres Scene width in mm @ 4 metres Scene width in mm @ 5 metres Scene width in mm @ 7 metres Scene width in mm @ 9 metres Scene width in mm @ 10 metres Scene width in mm @ 15 metres
2.1 108 2 286 6 857 9 143 11 428 16 000 20 571 22 857 34 285
2.9 88 1 655 4 965 6 620 8 275 11 586 14 896 16 551 24 827
3.5 73 1 371 4 114 5 485 6 857 9 600 12 342 13 714 20 571
3.6 72 1 333 4 000 5 333 6 667 9 333 12 000 13 333 20 000
3.8   1 263 3 789 5 052 6 315 8 842 11 368 12 631 18 947
4.0 62 1 200 3 600 4 800 6 000 8 400 10 800 12 000 18 000
4.3 58 1 116 3 349 4 465 5 581 7 813 10 046 11 162 16 744
5.0   960 2 880 3 840 4 800 6 720 8 640 9 600 14 400
5.5   873 2 619 3 490 4 364 6 109 7 855 8 727 13 091
5.7 46 842 2 526 3 368 4 210 5 894 7 579 8 421 12 631
6.0 45 800 2 400 3 200 4 000 5 600 7 200 8 000 12 000
6.5 44 738 2 215 2 954 3 692 5 169 6 646 7 384 11 076
8.0 34 600 1 800 2 400 3 000 4 200 5 400 6 000 9 000
8.5   564 1 694 2 259 2 824 3 953 5 082 5 647 8 470
9.0   533 1 600 2 133 2 667 3 733 4 800 5 333 8 000
11.5   418 1 252 1 670 2 087 2 922 3 757 4 174 6 261
12 23 400 1 200 1 600 2 000 2 800 3 600 4 000 6 000
15   320 960 1 280 1 600 2 240 2 880 3 200 4 800
16 17 300 900 1 200 1 500 2 100 2 700 3 000 4 500
18   266 800 1 066 1 333 1 866 2 400 2 666 4 000
25 11 192 576 768 960 1 344 1 728 1 920 2 880
39   123 369 492 615 861 1 107 1 230 1 846
50 5 96 288 384 480 672 864 960 1 440
69   69 208 278 348 487 626 695 1 043

Scene width is directly proportional to Lens - Object distance, for example a 3.6 mm lens (1/3" Sensor) at 1.5 metres captures a scene width of 2 metres, at 3 metres width is 4 metres, at 6 metres width is 8 metres, etc. etc.

Image height is 75% of width.

Figures in tables are calculated values, no allowance has been made for manufacturing tolerances, variations in image sensor dimensions or Monitor 'Over-Scan'.

If a common Video Monitor or TV is used to display images, up to ~ 15% of the image may be lost in 'Over-Scan' and be unseen.

If images are displayed on a PC Monitor using either our VIDEO-VGA converter or a PC Digital Capture Card & Computer 100% of the image will be displayed.


Lens Selection Guide for CCTV Camera with 1/4 Inc
www.cctvjakarta.com - 081316068899 - 02133098899 h Image Sensor

Lens focal length: mm Horizontal angle-of-view degrees Scene width in mm @ 1 metre Scene width in mm @ 3 metres Scene width in mm @ 4 metres Scene width in mm @ 5 metres Scene width in mm @ 7 metres Scene width in mm @ 9 metres Scene width in mm @ 10 metres Scene width in mm @ 15 metres
2.1   1 714 5 142 6 857 8 571 12 000 15 428 17 143 25 714
2.9   1 241 3 724 4 965 6 206 8 689 11 172 12 414 18 620
3.5   1 029 3 086 4 114 5 143 7 200 9 257 10 286 15 429
3.6   1 000 3 000 4 000 5 000 7 000 9 000 10 000 15 000
3.8   947 2 842 3 789 4 737 6 632 8 527 9 474 14 211
4.0   900 2 700 3 600 4 500 6 300 8 100 9 000 13 500
4.3   837 2 512 3 349 4 186 5 860 7 535 8 372 12 558
5.0   720 2 160 2 880 3 600 5 040 6 480 7 200 10 800
5.5   654 1 963 2 618 3 272 4 581 5 890 6 545 9 817
5.7   632 1 895 2 526 3 158 4 421 5 684 6 316 9 474
6.0   600 1 800 2 400 3 000 4 200 5 400 6 000 9 000
6.5   554 1 661 2 215 2 769 3 877 4 984 5 538 8 307
8.0   450 1 350 1 800 2 250 3 150 4 050 4 500 6 750
8.5   423 1 270 1 694 2 117 2 964 3 811 4 235 6 352
9.0   400 1 200 1 600 2 000 2 800 3 600 4 000 6 000
11.5   313 939 1 252 1 565 2 191 2 817 3 130 4 695
12   300 900 1 200 1 500 2 100 2 700 3 000 4 500
16   225 675 900 1 125 1 575 2 025 2 250 3 375
18   200 600 800 1 000 1 400 1 800 2 000 3 000
25   144 432 576 720 1 008 1 296 1 440 2 160
40   90 270 360 450 630 810 900 1 350
50   72 216 288 360 504 648 720 1 080
69   52 157 209 261 365 470 522 783
  • Measure the distance between the camera and the floor and check your CCTV camera has the correct lens focal length - see the table below. (We normally supply cameras with a 3.6 mm focal length lens.)
    Lens Focal Length
    2.9 mm
    3.6 mm
    4.6 mm
    6.0 mm
    8.0 mm
    Floor–Camera Height
    2.0–3.5 m
    2.5–4.5 m
    3.0–5.0 m
    4.0–6.5 m
    5.0–8.0 m

LEN05100DC 5.0mm-100.0mm Auto Iris Vari-Focus F1.8 1/3" Lens / CS Mount
http://www.dvrsecuritylab.com

Lens for security cameras. 5.0mm - 100.0mm IR/Day Auto Iris Vari-Focus F1.8 1/3" Lens / CS Mount.

LENSA VARYFOCAL_100_MM

Specifications
MODEL LEN05100DC
Focal Length 5.0-100 mm
Apeture (F) 1.8-360
Mount CS
Image format

1/3”

Angle of of View (HOR) 50.1°-2.8°
M.O.D (m) 0.2

Graph 1 – Field of view (1/3-inch cameras)

Choosing the correct lens
There is a simple relationship between the required field of view and the focal length of the lens to be used (see Field of View figure).
To determine this:
• Estimate or measure the maximum width “W” of the field of view.

• Estimate or measure the distance “D” between the camera and the object to be viewed.
• For 1/3” lens, use Graph 1 and for 1/2” lens use Graph
2. Find the point on the graph for the lens and the sensor format corresponding to the “W” and “D” coordinates.
To ensure complete coverage of the object,
select the lens indicated by the line above this object.
Normally, for optimum coverage of the field of view,
1/3” and 1/2” lens are used with camera heads with
1/3” and 1/2” format sensors respectively. However,
1/2” lens may be used with 1/3” cameras but the outer
areas of the field of view of the lens will not be seen by
the sensor.


1/2 INCH IMAGE SENSORS ----------->> 1=OBJECT WIDTH 2.OBJECT DISTANCE

BACA ARTIKEL LENSA DISINI

 

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Karya Usaha Sentosa
Jakarta cctv installers and cctv suppliers
Contact Person: Kusnadjaja:
Phone: 081316068899 - 021-33098899
email: kusnadjaja@gmail.com