Is this brokeh fringe?

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Is this brokeh fringe?
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I was running some experiments on my 500mm x 1.4 extender in my back yard and noticed some of the photos had this weird halo around the objects not in focus. At 100% crop it was very noticeable on the computer screen. The in focus subjects were fine and had no fringing at all. I tried applying and taking off all the lens corrections in DPP and adjusting the sliders around with no change. Is this brokeh fringing and is there any way to fix it? 
Here’s the cropped photo and the uncropped. The AF point was on the sad looking Malibu light.

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