I have bought a second hand D7k a few days ago and found some brown stains on my pictures even changing lenses and using the clean sensor feature didn't help.
I have contacted Nikon too they asked me to send it over for them to see. Anyone with such problem?
Thanks
how to test if it's dust on sensor: switch to manual mode and shoot at f22 (fill the frame with a white object - paper / wall etc).
zoom in and out to get a few shots (out of focus is alright!). the stain will be at the same spot on each shot.
Clean sensor won't shake away stubborn stains/dust on the sensor.
Try using a blower to blow the sensor (camera facing down). If this doesn't work, then do sensor cleaning.
Check youtube for videos on how they do it.
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