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Message: <blockquote data-quote="singlerosa_RIP" data-source="post: 480600" data-attributes="member: 15556"><p>Are you taking lots of shots that include blue sky taken at f/22? Most times, you'll notice dust/oil when you're stopped down and have a single color, light background. In fact, after you clean your sensor, you should take a shot of the blue sky or a white sheet of paper at f/22 and check for spots. I used to have more problems with spots when I only had one body and did frequent lens changes. Now, I keep my 70-300 on the D7000, 70-200 on the D600 and use the D750 for all else, with the 24-70 being on it most of the time.  Reducing lens changing really cuts down on issues. Changing lenses properly also helps. You can see many videos on proper technique as wall as sensor cleaning on YouTube.</p></blockquote><p></p>