Horizontal "rainbow" on some shots

I lent my brother my xt with my 17-85 lens on it.
He shot 2000+ shots on it over the course of a weekend and three nearly identical shots taken consecutively have horizontal banding like the attached picture.

The striping isnt the whole image, but only a band about 1/4 the image verticaly.

The same setup was used before and after the three bad shots without any issues.

Any ideas?

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exif as follows

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That is very disturbing. I can't offer any help.

I can tell you that i had that happen to me a few times, in strange lighting conditions with a sigma 28-90mm i used to have. did he have a polarizer on the lens?

seems like noise pattern, is the brightness increased on processing?

Looks like electro magnetic interference to me.

MikeMcL wrote in post #2365109
That is very disturbing. I can't offer any help.

I can tell you that i had that happen to me a few times, in strange lighting conditions with a sigma 28-90mm i used to have. did he have a polarizer on the lens?

There wasn't a polarizer involved on the lens.
Perhaps the windows in the airport were coated either with a tint or polarized glass.

I think you answered your own question there, taking shots through windows can have an effect on the image...

Taking shots through windows can indeed have all sorts of effects on the image. Check out this thread for a pretty extreme example.

I've seen it before where it wrecks the whole image, not a small portion of it.
Typically when a polarizer is used, not with a straight lens.

This is the first time I've seen such an occurrence with a DSLR.

Got to love the setting my brother was using eh? 800 asa f5.6@ 1/2000th... Some people I tell yah...