What are these tinted rings (low-light E-M5 w/flash)?

Started 7 months ago | Questions thread
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What are these tinted rings (low-light E-M5 w/flash)?
7 months ago

In Lightroom 5.3, I boosted Exposure by 3.4 and slid the clarity, vibrance and saturation sliders all the way to 100 to make this effect more prominent, but it was also visible with the sliders set to 0.

I used my new Nissin Di466 flash for this photo (just playing around outdoors at night with the new flash to see what it can do). I had the built-in Fresnel diffuser covering the flash when I took the photo.

If you look closely at the top corners of the image, bands seem to continue into the darkness above the building.

Where's the unwanted color coming from?

Thanks in advance!

 texinwien's gear list:texinwien's gear list
Canon EOS 300D Olympus OM-D E-M5 Canon EF-S 18-55mm f/3.5-5.6 Panasonic Lumix G 20mm F1.7 ASPH Panasonic Lumix G Vario 100-300mm F4-5.6 OIS +14 more
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