M8.2 horizontal banding

[twopointeight]

Printing 17X22, black and white conversions, all from the same interior space, the local library. All exposed at 650 asa, 35mm summilux aspherical, processed in LR3. They hold up very well, but one of the prints has light horizontal banding. Wondering why its just this one, from a series that is very consistently shot and processed? Any experienced clues?

 

[Gabriel M.A.]

Radio interference. I eventually figured it out when I did a number of shots next to a BlackBerry user.

 

[twopointeight]

That's sounds plausible. Hope you are right? Thanks.

 

[Monochrom]

I experienced such bandings at high iso and on jpegs, when developed on raw they disapeared.

Hope you solve this issue!