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Thread started 03 Sep 2011 (Saturday) 15:51
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Aberation or movement

 
Turves
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Sep 03, 2011 15:51 |  #1

I am interested in your opinions about an image I took.

On the left hand of the image is a lot of red blur, on the right of the image maybe some adsence of red. All on the vertical.

The image was shot on an EF-S Canon 17-85. Hand held but supported on a metal railing. From the metadata I think at 80th second and at full wide angle of the lens.

Is this typical of the aberation that you can expect of one of these lenses at its widest angle? Or does it need abit of ajustment?

Camera is a 450D.


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xarqi
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Sep 04, 2011 01:29 |  #2

It's lateral chromatic aberration, not camera movement. It will be more noticeable at wider apertures. The degree depends on the specific lens model also, so I'll leave it to other more familiar with the 17-85 to comment as to whether what you have experienced may be considered excessive.




  
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amfoto1
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Sep 04, 2011 01:56 |  #3

CA can be made worse by a filter on the lens... just how much depends upon the quality of the filter and it's coatings.

And it can be corrected to some degree with some softwares. Notice how it's most apparent at the point of highest contrast, too.


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macroimage
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Sep 04, 2011 03:12 |  #4

The EF-S 17-85mm has quite a bit of chromatic aberration at the wide end. What you are seeing is fairly normal for that lens under those conditions.

Canon's DPP can correct this automatically. Other raw converters like DxO Optics Pro and Adobe Camera Raw can also fix this aberration. You can fix it manually in Photoshop CS2 or later with the "lens aberration" filter if you started with a JPG or didn't correct in in RAW conversion.


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BigG81
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Sep 04, 2011 05:58 as a reply to  @ macroimage's post |  #5

The 17-85 came bundled with my 50D. To this day I've been shocked at the amount of colour fringing this thing can produce. And quite rightly pointed out that it's in a high contrast area.




  
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Madweasel
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Sep 04, 2011 09:44 |  #6

Yep, chromatic aberration. Lightroom is also good at cancelling it.


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GregoryF
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Sep 04, 2011 10:31 |  #7

It looks about normal for this lens at 17mm.


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