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Category: Problems with Photo Equipment - Tips & Tricks

Photography Question 

Luis E. Estrada 		 

Frame-edge Color Aberration?


 
  Color aberration at the upper right edge
Color aberration at the upper right edge
Notice the color "bleed" from a saturated blue sky at the upper right edge of the frame. This problem occurs intermittently. I don't quite know what combination of variables produce it.

Luis E. Estrada

  
 
I would like to know what is causing an intermittent color "bleed" that appears only at the right upper edge of the frame (usually with blue skies). I am using a Canon EOS1Ds body with an EF 35-350mm lens. The problem only manifests with this particular lens and it doesn't appear related to any given focal length or apperture combination (at least not one that I can detect).


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November 09, 2007

 
- Gregory LaGrange

BetterPhoto Member
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Gregory LaGrange's Gallery 		  Well, guess you know it's the lens. Maybe one of the elements inside is out of alignment or loose. You can try duplicating that picture and change focal lengths with several shots and see if anything happens.
You probably notice it with blue skies because of a large, bright area of a mostly uniform color.
Have you noticed that it shows up when shooting at angles pointing up?


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November 11, 2007

 

Luis E. Estrada 		  Thanks Gregory, Yes, it has to be the lens, and your theory of a loose element inside may explain the randomness of the problem.
I used it all day Sunday and took about 300 images with it, and did not see a single problem. Other times, several images in a session are affected.
I will follow your advice and try to duplicate a problem picture changing focal lengths and also tilting at various angles (when it fails again)
What looks weird about this problem is that the effect is almost linear (The sort of effect that you can produce with Photoshop with a feathered matte parallel to the frame... Lens problems tend to manifest in circular patterns. Also, I cannot detect the problem in areas other than sky or bright backgrounds. When dark surfaces are in that area of the frame (totally or partially) they don’t show this distinct linear bleed (look at the trees in the sample image; it seems like the problem stops suddenly there).


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November 12, 2007

 
- Gregory LaGrange

BetterPhoto Member
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Gregory LaGrange's Gallery 		  You don't notice it in the dark areas. You can see it in the very first patch of pine needles.
Non linear shutter functions like hang ups make a straight line, but I would expect a darker line. And straight.
Look at the images that happened yesterday and see what was in common, like aperture.
Maybe if you've tried cleaning the sensor you have some residue left on it. And like dust, it shows up at small apertures.


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November 12, 2007

 
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