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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 06 Jun 2007 (Wednesday) 19:42
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5D & 17-40 problem????

 
taygull
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Jun 06, 2007 19:42 |  #1

Take a look at this image shot at 17mm and tell me this is correct?

I shot this with my 5D @ 17mm with the 17mm-40mmL.

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I've got numerous that are like this that are unusable images.

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sumocomputers
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Jun 06, 2007 19:59 |  #2

I assume you mean the distortion (as seen in the water tower)?

I dont have a 5D to compare, but I do have Pixel Peeper. A quick look at 5D + 17-40L showing only 16-20mm Focal Length show some pics with similar distortion (although for some reason yours seems really pronounced).

http://www.pixel-peeper.com …ne&exp_max=none​&res=3&p=1 (external link)


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taygull
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Jun 06, 2007 20:11 |  #3

yes I am speaking of the distortion.


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Richard_Miami
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Jun 06, 2007 20:18 |  #4

I have never experienced that much distortion on my 5D @ 17mm.... the vignetting sure, but that gets fixed in PS in about 5 seconds. I just searched thru several folders to see if I can find some. .but nada... everything looks ok. Sorry not to be more helpful.


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oldsquawk
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Jun 06, 2007 20:23 |  #5

Which type of distortion disturbs you the most? If it is the converging lines thenyou will have to learn to live with those. Converging lines occur because you have tipped the camera up. If you are concerned with the barrel distortion, that is an issue with the 17-40L lens. You can eliminate the barrel distortion by using a Photoshop plug-in called PTLens. PTLens is produced by ePaperPress. You can download it here, http://epaperpress.com​/ptlens/ (external link). PTLens will detect which focal length you used to make the image and will apply the proper correction to eliminate the barrel distortion. It is so good, I can use my 17-40L for architecural images. I use PTLens to correct the distortion and then I correct the converging lines in Photoshop.

Photoshop CS2 and CS3 have a built-in function to correct barrel distortion but I do not find it as accurate as PTLens. Photoshop's corrections sometimes will leave wavy horizontal lines. But what you have is normal for the 17-40L lens.


oldsquawk

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jra
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Jun 06, 2007 20:24 |  #6

I would say that it looks normal. The main reason for all of the distortion is the UWA and the fact that you had pointed your camera upwards.

edit....I guess oldsquawk beat me to the post ;)




  
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aoleg
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Jun 06, 2007 20:26 |  #7

As already said, the reason for the distortion is camera tilt. Try to keep your lens horizontal to avoid this. As for this particular shot, you can correct it, to a degree, with Photoshop - Filter - Distort - Lens Correction, and playing with 'Vertical' slider.


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TheGreatDivorce
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Jun 06, 2007 20:47 |  #8

You pointed the camera up with an ultrawide lens ... the keystoning is inevitable. If you don't like it, look into the 24mm TS-E.




  
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taygull
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Jun 06, 2007 21:57 |  #9

Thanks.....I've just never researched this.


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airfrogusmc
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Jun 06, 2007 22:45 as a reply to  @ taygull's post |  #10

Actually I think it looks kind of cool. If you want perfection in architectural kind of work you'll need a view camera to really control perspective otherwise use the problems to your artistic advantage.




  
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quickben
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Jun 06, 2007 23:18 |  #11

I rarely shoot below 22-24mm with this lens (since I got my 5D) because of this problem.

Like someone mentioned, it's not the camera/lens' fault, it's a characteristic of ultra wide lenses. I tried a Sigma 12-24 once because it is supposed to be almost distortion-free, which it is. Free of BARREL distortion, not converging lines.

Yee canny change tha laws o' physics, once said a scottish teleport engineer.

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TheGreatDivorce
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Jun 06, 2007 23:57 |  #12

You can minimize it by placing the camera/lens level to the horizon, and approximately halfway between the top and bottom of the building/structure that you're shooting. Example, if you're shooting housing interiors with 10 foot ceilings, put the camera parallel to the floor, and halfway between floor and ceiling, and converging lines will be minimized.

But, this obviously doesn't help much for structures much taller than you :)




  
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canotographer
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Jun 07, 2007 00:19 |  #13

Agree to all of the suggestions above and this is normal for this kind of ultra wide lens. Photosop will be your best friend.


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Lens: EF70-200/2.8L IS EF100-400/4.5-5.6L IS EF 24-105/4L IS EF [COLOR=purple]17-40/4L EF-S 17-55/2.8IS [COLOR=#800080]EF 50/1.4
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5D & 17-40 problem????
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