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General photography questions and answers: Discuss Purple fringing...What causes purple fringing? Can it be avoided with shutter speed/exposure etc, or is it simply down to inferior quality ...
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Old 09-12-2008, 15:23   #1 (permalink)
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Purple fringing

What causes purple fringing? Can it be avoided with shutter speed/exposure etc, or is it simply down to inferior quality lenses?
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Old 09-12-2008, 15:33   #2 (permalink)
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Re: Purple fringing

It is mainly due to the lens, and better lenses tend to have less of it. It's most noticeable with dark objects (e.g. tree branches) against bright or blown highlights, and is often worse at the edges than in the middle.

Usually, keeping the aperture around the 'sweet spot' - typically f/8 or f/11 - will reduce fringing. It can also be removed in post-processing, although purple fringing can be more tricky than red/green fringing.
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Old 09-12-2008, 18:40   #3 (permalink)
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Re: Purple fringing

Just adding to what Silky says some of the latest cameras get rid of it automatically these days.
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Old 09-12-2008, 18:57   #4 (permalink)
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Re: Purple fringing

If you use Raw files and have Adobe Camera Raw (Photoshop or Lightroom), you can largely correct this. You probably can with other Raw converters but I am not familiar with them.

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Old 09-12-2008, 22:12   #5 (permalink)
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Re: Purple fringing

Thank you all for that. I,ve never been troubled with it before , but a batch of pics I shot recently with my Sigma 70-210 at 210mm in poor light was absolutely plaqued with it. It was,in fact, purple and Photoshop only partly reduced it. I,ll have to watch my exposures with that lens very carefully in future!
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