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CMOS cam and lens Q
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| Luken8r |
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Posts: 2
Joined: 27 Jun 2008
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Posted: Fri Jun 27, 2008 10:03 am
Post subject: CMOS cam and lens Q
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Im not sure if this is the place, but this is my first post, so here I go
Im working on a CCTV camera that has a 1/3" cmos sensor
(I cant post a link but its a uEye UI-1220)
But the lens that came with the system is a 1/2" lens
This guy here
(again no link, but its a Tamron 12vm412asir)
SPECIFICATIONS
Focal Length 4-12mm
Iris Range F/1.2 - Close
Iris Operation Manual
Focus Operation Manual
Mount C
1/2" Angle of View (wide/telephoto) 93.6° x 68.9°/31.2°x23.4°
Focusing Range 0.3m ~ INF
Back Focus (in air) 10.157mm ~ 19.911mm
My problem is that I need a wider viewing area. I need to mount the camera on a car and the field of view isnt wide enough for my application. The lens says it has a field of view of 93* which should be good, but when I actually measure the FOV, its only like 63* which doesnt work
My question is, what happens when you put a 1/2" lens on a camera that has a 1/3" sensor. If the answer is a smaller FOV, then we are going to need a different lens that matches with the camera. I have no clue about lenses and cameras and the like. Is there a quick FAQ for this stuff? I wasnt able to find anything when I did a quick search.
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| scorpion |
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Posts: 2802
Joined: 26 Mar 2007
Location: Melbourne Florida
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Posted: Fri Jun 27, 2008 11:04 am
Post subject:
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| survtech |
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Posts: 673
Joined: 21 Mar 2007
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Posted: Fri Jun 27, 2008 3:46 pm
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The major problem with that camera is that it is C mount, and not CS mount. The pickings are pretty slim in C mount lenses and while you can use a C mount lens on a CS mount camera (with a 5mm spacer), the opposite is not true.
Fujinon makes a 1.4mm fish-eye lens that will fit C mounts. Part number is FE185C046HA-1. 1.4mm (Fish-eye), manual iris, fixed focus, F1.4, 1/2" format. C-Mount, 5 MegaPixel. 185 degree field of view (less for 1/3").
By the way, you don't need a 1/3" lens for a 1/3" camera. You can use 1/3", 1/2", 2/3", 1" or any lens that is made for cameras with imagers that are the same size or larger.
You should not, but can use a lens made for a 1/3" camera on a 1/2" camera. It will work but the resulting image will not fill the whole screen and will be round, like looking through a telescope.
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| lendesigner |
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Posts: 2
Joined: 30 Jun 2008
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Posted: Mon Jun 30, 2008 11:10 am
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because you use a 1/3 camera to meet a 1/2 lens,so the FOV is not enought than 1/2 lens used to design,you change a 1/2 camera.so you
can find a more FOV.
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| survtech |
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Posts: 673
Joined: 21 Mar 2007
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Posted: Mon Jun 30, 2008 12:19 pm
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As long as the lens is made for the same size imager or larger, it doesn't matter what size imager the lens is made for, just the focal length. On, for instance, a 1/3" camera, a 1/3" 4mm lens will give approximately the same field of view as a 1/2" 4mm lens or a 2/3" 4mm lens.
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