 |
|
 |
Quick lens help.
|
|
|
| jmsjabb |
|
Posts: 1
Joined: 08 Oct 2008
|
|
Posted: Wed Oct 08, 2008 4:45 pm
Post subject: Quick lens help.
|
I need a camera to view cars at approx 35 - 40 m from camera and approx max 12 m wide at the 40m.
What is the best option and is the lens right for my application?
|
|
|
|
|
|
|
| survtech |
|
Posts: 712
Joined: 21 Mar 2007
|
|
|
Posted: Wed Oct 08, 2008 5:16 pm
Post subject:
|
You would need a 15mm lens on a 1/3" camera or a 11mm lens on a 1/4" camera. The easiest way to get the exact field of view you want would be to use a varifocal lens or buy a camera system that has a varifocal lens. Your best bet there would probably be a camera with a 5-50mm lens.
If you need to see the cars in low light, choose a true day/night camera with an auto-iris varifocal lens.
|
|
|
|
| ipman |
|
Posts: 24
Joined: 09 Jan 2007
|
|
|
Posted: Mon Nov 17, 2008 7:25 am
Post subject:
|
Previous answer is correct, but strictly speaking you should also consider camera installation height.
For example, if you put camera on 25 meters pole you will get
18 mm for 1/4" camera
and 12 mm for 1/4"
It is very easy to calculate lens and FOV using CCTV Design Tool
|
|
|
|
|
Options and Permissions
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum
|
| Page 1 of 1 .:. |
|
|
|
