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Message: <blockquote data-quote="Dave_W" data-source="post: 149581" data-attributes="member: 9521"><p>If there were actually dust or oil on your sensor, then yes. It would be horribly bad for it and your camera would stop working fairly quickly. However, the dust and oil you see is not on your sensor. Depending upon what camera you have, that dust/oil is on your OLPF filter (and in the case of D800E and D7100 it's just a slab of optical glass) and is nowhere near your actual sensor. So while oil and dust is not a good thing to see in your images, it probably won't do any long term damage, especially considering electronic oil is acid free.</p></blockquote><p></p>