CMOS cam and lens Q

[Luken8r 0]

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.

[scorpion 0]

I do not think there is anything here to answer your question, but you can take a a look, and perhaps one link, might lead to a link that may answer your question.

 

http://scorpiontheater.com/camlab.aspx

 

http://scorpiontheater.com/links.aspx

 

You def need to match the 1/3 lens with the 1/3 cam.

 

The lower the mm number the wider the viewing angle.

 

3.8 or 4mm is what is used on most cheap bullet cams.

 

2.5 is the start of where the video will have the fisheye effect. The lower the number from here then the more it gives you the view like a peep hole would look.

[survtech 0]

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.

[lendesigner 0]

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.

[survtech 0]

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.