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RF 24-105 F4L horrible purple fringing

Started Apr 28, 2021 | Discussions thread
Karl_Guttag Senior Member • Posts: 1,883
I think you may be expecting too much out of the lens

phatgreatwall wrote:

thanks for all the info. i downloaded a trial of DXO and it works like magic. DPP/Luminar could not completely eliminate it, which is surprising since DPP is supposed to be Canon's official software that covers their lens flaws. also the fact that an L lens exhibits such bad purple fringing is a shocker, i would've thought L for the price would be at least better than my iphone.

I'm not an expert on this, but my understanding is that purple fringing is largely due to the UV light getting to the sensor (see: https://en.wikipedia.org/wiki/Purple_fringing). UV light is out of the range of wavelengths for which the lenses are designed, but which the camera ends up detecting as purple.

Even people with very high-end lenses will get purple fringe in the right conditions. It turns out the overcast days have a lot of UV light which makes the problem worse.

In the cases where purple fringing becomes seriously bad, it can be easily removed. But you may not want to process it out all the time due to the computational effort and time and the risk of damaging something else in the image.

 Karl_Guttag's gear list:Karl_Guttag's gear list
Canon EOS R5 Canon RF 15-35mm F2.8L IS USM Canon RF 24-70mm F2.8L IS USM Canon RF 70-200mm F2.8L IS USM Canon RF 24-240mm F4-6.3 +14 more
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