24-105 distortion.

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CheekyMonkey

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Hi

I've recently bought a 6D with the 24-105, I haven't had much chance to play around with it but i popped up a nearby beacon to try it out ( i was hoping for better storm clouds ) Anyway i went up to try some exposure bracketing for a HDR shot. When i got home I found that the right hand column looks like its leaning in. I went back up tonight to make sure i was level, I checked with the in camera level and that was saying straight, it looked straight to the eye but through the viewfinder it was as the photo shows. I thought Photoshop would sort it out, it didn't i had to drastically mess with it in the lens correction settings.

Ive created a new Flickr for this forum and the images are on http://www.flickr.com/photos/99414714@N08/

Just 3 images which relate to this post.

Any suggestions??

Dave
 
Use lens profile and apply anti-distort in DPP or Lightroom?
 
Yeah, if you open it up in Camera Raw you can apply lens profile correction there the same as with LR.

That said, the second image looks straight (first appears to lean right, third left) so are you sure it's not just perspective?
 
Number45 said:
Yeah, if you open it up in Camera Raw you can apply lens profile correction there the same as with LR.

That said, the second image looks straight (first appears to lean right, third left) so are you sure it's not just perspective?
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The 3rd one is as shot and yes it looks like its left, the second image is the 3rd image that I've messed about with in lens correction in Photoshop (not just the check box but full on vertical distortion) The first one is what I took yesterday and just rotated the image and then cropped it slightly to remove the black edges it was late and I just did it quickly, thats why its not spot on.

Perspective maybe but its really confusing me.
 
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CheekyMonkey said:
Hi

I've recently bought a 6D with the 24-105, I haven't had much chance to play around with it but i popped up a nearby beacon to try it out ( i was hoping for better storm clouds ) Anyway i went up to try some exposure bracketing for a HDR shot. When i got home I found that the right hand column looks like its leaning in. I went back up tonight to make sure i was level, I checked with the in camera level and that was saying straight, it looked straight to the eye but through the viewfinder it was as the photo shows. I thought Photoshop would sort it out, it didn't i had to drastically mess with it in the lens correction settings.

Ive created a new Flickr for this forum and the images are on http://www.flickr.com/photos/99414714@N08/

Just 3 images which relate to this post.

Any suggestions??

Dave
Click to expand...

That's not lens distortion, eg barrel or pincushion, though the 24-105 has plenty of barrel at the wide end. Easily corrected in post processing, as mentioned.

That's just the natural perspective effect of shooting close, known as converging verticals, nothing to do with the lens as such, though everything should be nice and square if the camera is dead level. My experience of in-camera levellers is they're not always spot on.

Anyway, still very easy to correct in post processing. In Lightroom, all these things and more can be sorted out in seconds :thumbs:
 
Ah I see, that wasn't clear to me from the original description my apologies.

You mention in the first post that it looks like the right column is leaning in, but to me it looks as if the entire structure is leaning to the left. It's difficult on that third shot to determine if the horizon is straight (because obviously the mound obscures the right hand side), or perhaps whether the leaning is caused by the mound itself.
 
HoppyUK said:
That's not lens distortion, eg barrel or pincushion, though the 24-105 has plenty of barrel at the wide end. Easily corrected in post processing, as mentioned.

That's just the natural perspective effect of shooting close, known as converging verticals, nothing to do with the lens as such, though everything should be nice and square if the camera is dead level. My experience of in-camera levellers is they're not always spot on.

Anyway, still very easy to correct in post processing. In Lightroom, all these things and more can be sorted out in seconds :thumbs:
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Thanks for the advice everyone.

Hoppy, I get what you're saying but it seems way off and the post processing work was drastic to level it out. If I was not dead level I was very near it. I'll try with some other photos. Thanks for your help.

:)
 
CheekyMonkey said:
Thanks for the advice everyone.

Hoppy, I get what you're saying but it seems way off and the post processing work was drastic to level it out. If I was not dead level I was very near it. I'll try with some other photos. Thanks for your help.

:)
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I think Hoppy is right. Distorted buildings such as yours are often the result of more than one aspect of physics. Applying a lens profile will automatically sort out lens distortion as such - although sometimes at the wider end of a zoom I find it better to add a little more correction manually.

Converging verticals can to some extent be sorted with the vertical slider, and if you aren't at absolute right angles to your subject you can use the horizontal slider. At the very end of the process you can then correct the horizon if necessary.

It may take a while to work out what to do with individual images but just experiment!
 
jerry12953 said:
I think Hoppy is right. Distorted buildings such as yours are often the result of more than one aspect of physics. Applying a lens profile will automatically sort out lens distortion as such - although sometimes at the wider end of a zoom I find it better to add a little more correction manually.

Converging verticals can to some extent be sorted with the vertical slider, and if you aren't at absolute right angles to your subject you can use the horizontal slider. At the very end of the process you can then correct the horizon if necessary.

It may take a while to work out what to do with individual images but just experiment!
Click to expand...



:thumbs:
 
CheekyMonkey said:
Thanks for the advice everyone.

Hoppy, I get what you're saying but it seems way off and the post processing work was drastic to level it out. If I was not dead level I was very near it. I'll try with some other photos. Thanks for your help.

:)
Click to expand...

If you are close and at max wide-angle, then you must be dead level to eliminate converging verticals. Even a slight error at close range with throw it out.

There is another thing going on in that image though which is pulling the building out of shape towards the corner. This is the result of the lens' rectilinear correction at work. A basic rule with wide-angles is don't put anything that needs to be geometrically correct near the edges or corners - eg like groups of people, or the ones towards the edges will look very fat and have egg-shaped heads LOL

DxO has 'keystoning' software that addresses this and though I've not tried it, it looks quite effective. Here http://www.dxo.com/intl/photography/dxo-viewpoint/features and some more examples here http://www.northlight-images.co.uk/reviews/plugins/dxo_viewpoint.html
 
jerry12953 said:
Excuse me jumping in here, but Hoppy......

...... does the software you mention above do anything that can't be done in Lightroom?
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Yes. From the DxO link above:

"Restore the natural proportions of the people on the edges of your photos in just one click. DxO ViewPoint automatically corrects stretched-out faces or distorted body shapes that can occur when you shoot with a wide-angle lens (a phenomenon known as “volume anamorphosis”). This exclusive feature from DxO Labs, adapted to your specific equipment, is particularly useful for group or wedding photos." http://www.dxo.com/intl/photography/dxo-viewpoint/features

As I say, not used it myself. Available as a standalone or plug-in for Lightroom.
 
jerry12953 said:
DxO Viewpoint looks a bit like the "Upright" feature in LR5.

But as I haven't used either I could be wrong:).
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As I understand it, it's not like LR's corrections (else I guess they wouldn't sell it as a LR plug-in).

I don't think it's a complete cure for the wide-angle 'volume anamorphosis' thing, as it effectively introduces a fair bit of barrel distortion to push those stretched corner subjects back into shape. In other words, it will make pulled faces and fat bodies look better, but straight lines will get bowed.

There's some debate on it here http://www.dpreview.com/news/2012/09/05/DxO-Labs-announces-ViewPoint-distortion-correction-software and in the DxO example there, you can easily see how the guy's face is improved a lot, but the pillars beside him are then curved.
 
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