What's going on in the background

Tom Reichner wrote in post #18042643
Can you see this problem when viewing the images on the camera's LED display? Looking for it there would at least eliminate (or confirm) the possibility that it is something that is caused during the downloading/processing stage.

By the way, there are no places that Pika live in close proximity to chain link fences, at least nowhere that I have ever heard of. So any suggestions that it is actually caused by a fence are really not plausible.

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Obviously its not a chain link fence, but anything between the lens and subject could cause a similar effect. It looks like it is something on or in the lens because the angle changes (or stays the same, depending on how you look at it) as the camera is rotated from portrait to landscape.

It definitely shows up on the LCD screen. It's interesting, looking through more photos, the lines only show up for (some) messily defined objects that are a little bit out of focus either in front or ahead of the subject--the stuff that is totally OOF is just a smooth seamless blur. Some examples with nothing between me/subjects (not the best photos but I feel illustrative ):

Far background, no lines I can see.

IMAGE LINK: https://flic.kr/p/JeeH​AG

IMAGE LINK: https://flic.kr/p/HRFm​11

That is so very strange. Have yo beeen able to try out a different lens with the same camera, or a different camera with that lens? My money is on your sensor or camera doing this, but you would need to swap out bodies and lenses to be sure.