Fuji X-T1 color fringing

[pcmofo]

I took some photos last week and I am editing them now and I am noticing a purple/green color fringing on the photos. This does not appear to be chromatic aberration as it is happening in the middle of photos not on edges etc. I attached 3 images that show the spots which appear to glissen green/purple like an oil spill would.

 

Any Idea what is causing this? All shots taken with speed lights only in a dark room and the 56 1.2 @ 5.6 1/160th, ISO 200

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[copidosoma]

That is color moire.

 

One of the reasons some cameras have low pass filters is to remove that effect.

 

It can occur with subjects with fine parallel lines (like fabric and bird feathers for example).

[pcmofo]

Thanks for the reply. It is also happening on skin. 

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[Vidalgo]

It can occur with subjects with fine parallel lines (like fabric and bird feathers for example).

 

Even without a lines:

 

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vibrance raised to make it more visible

[copidosoma]

It is basically an interference pattern. Wikipedia has a decent explanation of it (with formulas fir extra fun). Typically, you can reduce/eliminate it by slight changes to your position from the subject but sometimes it is pretty persistent.

 

I think there are plugins to reduce it but as you would imagine, they can be pretty heavy handed and you lose alot of detail. Best to avoid it.

 

Vidalgo,

Honestly, I don't really see it in the rock shot. Or at least it isn't something that couldn't be confused/passed off for natural variance in the rock texture and color. But, I imagine it can happen with fine details of all sorts, it is just alot easier with parallel lines which interfere easier.

 

The skin example is not as common in my experience but makes sense. If you look at your skin (particularly guy's skin and particularly on the hands) you have pretty visible lines. Definitely a bigger problem in fashion work where you are always dealing with fabric. It can totally destroy a good bird shot too.