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RF 24-105 F4L horrible purple fringing

Started Apr 28, 2021 | Discussions thread
Mako2011
MOD Mako2011 Forum Pro • Posts: 28,706
Not....
2

Tristimulus wrote:

Karl_Guttag wrote:

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.

UV light does not reach the image sensor at all. Cameras have UV and IR block filters over the image sensor.

That's not completely true.  The filter stack does block most (99%+)  UV that might affect normal shots but not all.  The only time where you might see the effect of some UV light getting trough is at very high shooting altitudes..well above 10,000 feet...and it usually manifests with a bit of "haze".  Using an IR filter on the lens (A vs B comparison) makes it pretty obvious.  Very Very few folks will run into the issue and the degree will vary by model.  I only know because I've done a lot of shots above 18,000ft

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My opinions are my own and not those of DPR or its administration. They carry no 'special' value (except to me and Lacie of course)

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