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Category: Problems with Images

Photography Question 

Pamela K 		 

Removing glowing red outlines from images


 
  Snow Geese
Snow Geese
f3.5 1/250s @ 70.00mm with 1.7x telephoto extender

Pamela K

  
  Lost Crane
Lost Crane
f 3.5 1/320s @70.00mm with 1.7x telephoto extender

Pamela K

  
 
Some of my images, especially those with bright objects, like snow geese, have glowing red images around them. Does anyone know a way to get rid of these? Also, does anyone know how to avoid getting these borders when taking the photo?

I'm attaching a couple of examples.

Thank you,
Pam


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November 29, 2004

 

Kip T. Berger 		  Hi Pamela,
Sorry, but I'm not seeing a red glow or any type border in either of your examples?


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November 29, 2004

 
- Bob Cournoyer

BetterPhoto Member
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Bob Cournoyer's Gallery
  How odd. I don't see any in the top pic, but the 5 geese along the bottom of the lower pic have glowing red lines on their backs. No idea what it is..
Bob


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November 30, 2004

 
- Gregory LaGrange

BetterPhoto Member
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Gregory LaGrange's Gallery 		  Red outline on some the geese in the foreground, green outline on some in the background.
Chromatic abberation. Could be the teleconverter. Different wavelengths of light are being focused to different spots. One of the things that is tried to avoid in lens construction. Like trying to build an engine that makes good power and is fuel efficient.
Try without the teleconverter to get rid of it.


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November 30, 2004

 

Pamela K 		  Thank you, Kip, Bob, and Gregory.

Gregory, do you know why this would only occur when I have a white subject? Most of my shots with this teleconverter come out fine. Even a lot of my snow geese shots are ok with the teleconverter. Are there certain lighting conditions or sun angles that I should avoid because of extra reflection? I'll try some without the teleconverter and see what happens. Thanks.

I'm hoping to get a new Canon 20D soon, hopefully the problem will go away with that.

Thanks again,
Pam


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November 30, 2004

 
- Gregory LaGrange

BetterPhoto Member
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Gregory LaGrange's Gallery 		  easier to see it around a white thing, and white has all wavelengths in it. Not going to be much red wavelengths in certain colors.
I don't see anyway of avoiding it outside of avoiding the exact specifications of each shot when you see it.
Abberations involve focal lengths, apetures, if the light is passing thru the center or towards the edges of the glasses, lens design and construction stuff.
Just shoot when you can shoot the same as the ones that come out right.


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November 30, 2004

 

Pamela K 		  Thank you, Gregory. I'll go through my shots and see if I can find a pattern in what worked and what didn't...

Pam


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November 30, 2004

 
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