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. |
|
| 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
Your profesional CCTV Installers Jakarta
Call: 081316068899 - 021.33098899
www.cctvjakarta.com |
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