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Message: <blockquote data-quote="Clovishound" data-source="post: 807078" data-attributes="member: 50197">I shot a few birds at the backyard feeder, and no sign of the offending spot. I got lucky. I remember something about a reference photo option and thought I'd check it out, and then found the pixel mapping near the sensor cleaning option. I suppose the pixel mapping service Nikon offers would be valuable for cameras without that feature in their software. My D3400 doesn't have it. Had I sent it off, they would likely have just used the menu option and performed the other maintenance they do and shipped it back fixed, when I could have fixed the main issue myself. There are so many menu options in this camera it's mind boggling. Perhaps my experience will save someone else from a needless trip to Nikon service. I'm glad Nikon included this in their software.</blockquote>