What causes fringing, technically?

Started Jun 17, 2012 | Discussions thread
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dark goob
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What causes fringing, technically?
Jun 17, 2012

Please answer these questions with as scientific answers as possible.

What's the best third-party RAW converter for de-fringing? (The main lenses I use that would need it are Olympus ZD and ZD M wide angles, so I've had bad luck with canned "lens profiles." I've yet to find reliable de-fringing for 12-60, 7-14, or 8 fisheye.)

What is the best camera sensor for avoiding fringing, and why?

Which lens maker has the best anti-fringing coatings? (Nikon nano-crystal vs. Lumix nano-surface vs. ...?)
What exactly are these new "nano" coatings and how do they work?

Could it be technically possible to apply such coatings to older lenses with the right equipment (ignoring cost), or is there a technical reason why such coatings can only be applied at the time of lens manufacturing?

I've noticed fringing is not uniform across the lens. At the edges it's always worse. So, why do de-fringing controls in ACR seem to affect an image uniformly as opposed to affecting it more and more the closer you get to the edges? Or am I understanding it wrongly?

Thanks.

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