Lens distortion. Any cure?


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y0ngcheng

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Nov 24, 2003
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Just curious, since technology is so advance now..
Are there any softwares that are able to cure lens distortion? Noise images can be cure by Noiseninja and ect. I realise this problem after I shot some images with super wide angle. Anyone? :p
 

student

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Jul 26, 2004
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It can be cured by an understanding of why the distortion is there in the first instance, and situations where the distortion will be apparent.

It can also be cured by using the distortion for artistic purposes.
 

Ansel

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Spherical distortions can be solved by those standard tools, but aspherical lens distortions are more problematic. You may require more specialised tools. I understand iNova's ebook on the D70 comes with some of these tools for aspherical lens distortion correction.
 

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Ansel said:
Spherical distortions can be solved by those standard tools, but aspherical lens distortions are more problematic. You may require more specialised tools. I understand iNova's ebook on the D70 comes with some of these tools for aspherical lens distortion correction.
I believe PTLens can correct for aspherical lens distortions, not just simple pincushion and barrel distortion.
 

jbma

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photopurist said:
Otherwise, use a large format camera.
Or get a better lens :bsmilie: . Just kidding. There are tools out there that can help you. Even Photoshop can correct it but only to a certain extent.
 

Apr 8, 2005
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#11
espn & jbma,

Isn't it obvious that if you want to "cure" some of that distortion problems, use a large format camera. I do not see anything wrong with this statement. You can put on a Leaf back if you want digital.
 

student

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photopurist said:
Otherwise, use a large format camera.
I certainly cannot lay claim to be an expert in large format photography, although 90% of my photography is with large format equipments. I am just a newie who like to work with the "big" camera.

I think yOngcheng is talking about the distortion inherent in certain lenses, especially with the very wide angle ones.

I do not use very lenses with my large format, so I do not see obvious "distortions" down to 80mm with my 4x5. There are perspective changes with wide angles, and telephotos for that matter. But distortions inherent in a lens?

Can you advise how a large format equipment can reduce distortions inherent in lenses? I am not talking about "distortions" like perspective changes.
 

dkw

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#14
y0ngcheng said:
Just curious, since technology is so advance now..
Are there any softwares that are able to cure lens distortion? Noise images can be cure by Noiseninja and ect. I realise this problem after I shot some images with super wide angle. Anyone? :p
If you've got the dough, try DxO optics --> http://www.dxo.com/en/photo/optics_pro/feat_benefits.php#anchor2

Apparently they've got algorithms to correct for a variety of issues from a range of lenses and cameras.
 

jopel

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Dec 21, 2004
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#15
y0ngcheng said:
Just curious, since technology is so advance now..
Are there any softwares that are able to cure lens distortion? Noise images can be cure by Noiseninja and ect. I realise this problem after I shot some images with super wide angle. Anyone? :p
Maybe give this freeplugin a try,Lens Correction it helps correct some of my photos but not all.
 

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Ansel said:
Spherical distortions can be solved by those standard tools, but aspherical lens distortions are more problematic. You may require more specialised tools. I understand iNova's ebook on the D70 comes with some of these tools for aspherical lens distortion correction.
ermm, can elaborate on this point?

from my understanding spherical distortion happens when the light from a specific point of space do not merge into the same point on the film/ccd, hence producing blur image.

whereas distortions is slightly different, it happens where all the rays of light from that same point falls onto the same place on the film/ccd, but just that the whole image is virturally stretched or compressed by the formula S-cube, where S is the distance from the centre of the image.

i know there is a function in PS that simply distort the photograph, hence, if our image is positively distorted, it can apply some negative distortion to compensate the lens distortion. ermm... hope this is helpful
 

Ansel

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#17
asdfasdfadsf said:
ermm, can elaborate on this point?

from my understanding spherical distortion happens when the light from a specific point of space do not merge into the same point on the film/ccd, hence producing blur image.

whereas distortions is slightly different, it happens where all the rays of light from that same point falls onto the same place on the film/ccd, but just that the whole image is virturally stretched or compressed by the formula S-cube, where S is the distance from the centre of the image.

i know there is a function in PS that simply distort the photograph, hence, if our image is positively distorted, it can apply some negative distortion to compensate the lens distortion. ermm... hope this is helpful
OK, aspherical distortions creates distortions in images that produces a mild "M" shape on horizontally running straight lines. I remember reading an article about it, but I can't seem to find the link at this point. Sorry.
 

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Ansel said:
OK, aspherical distortions creates distortions in images that produces a mild "M" shape on horizontally running straight lines. I remember reading an article about it, but I can't seem to find the link at this point. Sorry.
arh.. Icic... probably while trying to correct the spherical aberration, the aspherical surface of the lens made the relationship of the distortion aberration more complicated, so instead of S-cube, becomes a higher order, hence requires a more complicated calculation to correct. But now great is the difference? anyone knows?
 

yanyewkay

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Sep 22, 2004
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#19
wah so chim.. i tot photography can let me out on engineering..

anyone has pics to show "aspherical lens distortions" all the descriptions on it but I canno tvisualise.
 

Ansel

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#20
asdfasdfadsf said:
arh.. Icic... probably while trying to correct the spherical aberration, the aspherical surface of the lens made the relationship of the distortion aberration more complicated, so instead of S-cube, becomes a higher order, hence requires a more complicated calculation to correct. But now great is the difference? anyone knows?

OK, found. Scroll to the part under "extras".

http://www.digitalsecrets.net/secrets/D70/D70FAQ.html
 

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