Fish-Eye effect

[sretooh 0]

I have a wide angle lens, 2.8mm, on a 1/3CCD chip camera and the picture looks great, but I am getting the good ol' fish eye effect. Is it possible that by switching to a larger chipset camera (1/2", 3/4" etc) or better lens that I could possibly eliminate this "fish-eye" effect?

 

Thanks - sorry if not posted in correct location. New user.

[Jasper 0]

I would suggest getting another lens. Maybe even a varifocal to allow you more flexability. You are going to get that fish eye effect because that lens is just to small for that camera.

 

You would need something like a 3.6mm or 4mm just for it to look normal.

[rory 0]

Thats a wide angle lens, if you switch to another it will simply be like using a narrower lens, so you wont see as much.

[kandcorp 0]

A 1/4" CCD Camera will improve the "Fish-eye look" from a 1/3"

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i.e.

 

1/3" CCD w/ 2.8mm will give you a 81.2 degree horizontal FOV

 

1/4" CCD w/ 2.8mm will give you a 59.49 degree horizontal FOV

 

1/2" CCD w/ 2.8mm will give you a 97.63 degree horizontal FOV, but if your talking about 1/2" I dont think you can find any cameras with 1/2" CCD's that will accept a board lens.

[rory 0]

Yeah but its not improving it as how he wants, sounds like he still wants the same FOV but without the Fisheye effect and that doesnt happen.

[kandcorp 0]

True, no matter what CCD size your still going to get that fish-eye look. It may look a little better between the sizes but still fishy.

[Cooperman 0]

A 2.8mm or 2.9mm lens on a 1/3" camera is simply classed as an ultra wide angle (equivalent to 3.6mm or 3.7mm on 1/2", or 4.8mm on 2/3").

 

Describing a mild case of barrel distortion is not strictly speaking a fish eye lens. If there is a significant level of distortion, then the chances are it's probably a rubbish lens.

 

In practice, a fish eye optic will generally give a circular image or acutely distorted near full frame image, with horizontal angle coverages normally well in excess of 140 degrees (ish)

[rory 0]

yep, fish eye is more like 1.5mm ... was just going along with his terms ..

[sretooh 0]

Thanks everyone for the responses.

 

Yeah I have a specific field of view, which requires the 2.8mm lens, but the customer doesn't like the curvature that it puts on the picture. I can't go to a different size lens because then my fov would be smaller and that would require me to add more cameras to cover the area. I may end up having to do this anyway. thanks again.