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Message: <blockquote data-quote="hark" data-source="post: 210468" data-attributes="member: 13196">I agree. I have a hot pixel problem with my D90. It shows up as a red dot. I first noticed it in the theater photos I shot for a local school and initially thought it was from someone shining a laser pointer onto the stage. The hot pixel happened from shooting at a high ISO and tends to show up now as that red dot in photos shot at ISO 400 and higher. My D600 has had a chronic problem with the oil/dust. Those spots only show up when using small apertures such as f16 and smaller regardless of the ISO. The oil spots are somewhat opaque and look different than a hot pixel.</blockquote>