After 6 months and 10k shots, the sensor of my D750 have more than 100 oil spots (I shot landscapes at f11 and they are very noticeable), mainly distributed along the right side of the sensor (when seeing a photo). I never changed my 28-300 and this is absolutely abnormal to me. I owned a Canon 60D for several years, more than 200k shots, normally changing lenses, and never have this level of dirtyness. I went to Nikon Service in Santiago de Chile but they don't want to recognize the problem that is the almost the same of D600 in my opinion ...only a free cleaning.
I think that Nikon Quality Control Department is having big problems
