Physical lens model

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majordack
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Joined: Fri Jun 12, 2009 4:52 pm

Physical lens model

Post by majordack » Fri Jun 12, 2009 5:36 pm

so i thought i would try once again to model a camera lens model i searched up fisheye lens diagram
so i modeled it and thats the third photo and here is a render from it

my questions
1) what IS the lens considered to be?
2) this isn't supposed to be the view into a fisheye right?
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Doug Armand
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Re: Physical lens model

Post by Doug Armand » Fri Jun 12, 2009 7:12 pm

I've never seen a fisheye look like that technical drawing - it looks more like a telephoto or zoom lens to me.
Doug

Doug Armand

majordack
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Joined: Fri Jun 12, 2009 4:52 pm

Re: Physical lens model

Post by majordack » Fri Jun 12, 2009 8:01 pm

i never said it was.. i know what a fisheye lens setup looks like... but this might have been an early design of what might have been close to fisheye... but i guess its just a teledistorsion lens...

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Doug Armand
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Re: Physical lens model

Post by Doug Armand » Fri Jun 12, 2009 9:13 pm

majordack wrote:i never said it was.. i know what a fisheye lens setup looks like.
my mistake but from what you posted that was what I read it as:
majordack wrote:i searched up fisheye lens diagram
so i modeled it.
Doug

Doug Armand

Kyokutan
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Joined: Tue Oct 17, 2006 2:56 am

Re: Physical lens model

Post by Kyokutan » Sat Jun 13, 2009 1:26 am

I think you make one major error in reasoning:

When looking through a fisheye-lens with your eyes you won't see the effect you await.
Also when looking through a tele-lens you don't see a tele effect.

The lens you build is a lens for a camera... so the effect is only visible an a projection-plane.

If you want to use this lens you got to build a camera body and where the sensor/film whould be you make a white plane... then render this plane and you got your fisheye-effect.

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dougal2
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Re: Physical lens model

Post by dougal2 » Sun Jun 14, 2009 9:17 am

I did a big analysis of a modelled fish eye some years ago. I found that I could get a nicely distorted image looking straight into the lens. With the projection method, I could never get much better than a blurry image, it was near impossible to precisely locate the focal plane.

See my old thread here: http://www.indigorenderer.com/forum/vie ... f=3&t=1590

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