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<blockquote data-quote="Englischdude" data-source="post: 271349" data-attributes="member: 16372">Hi Adox66,if it is not shifting with the blower at all, then I would imagine it is some oil or other contamination adhered to the sensor surface, from the shutter mechanism for example. As the camera is only 5 weeks old it may be that you can get it cleaned under warranty, take it in to where you bought it and ask, if they try to charge you for he service make a scene and play your &quot;only 5 weeks old for heavens sake&quot; card. If you can make another shot of the sky at the HIGHEST F-number, so the smallest aprture, then the contamination will be easier to define.I totally support you learning to clean the sensor yourself. It really is not that hard, and if the D7100 is like my D7000, you are not cleaning the sensor directly, but rather the low-pass filter, which is a glass filter covering the sensor. Many make a big deal about cleaning the sensor but it is not that hard. Another thought, the D7100 should have a clean function in the menu, try that and see if the contamination shifts. For info on how to do this on your camera, read the manual. Any further questions please post. For cleaning the sensor I use the Sensorwand, with PECPADS and eclipse fluid.Please let us know how it goes.RegardsMartin</blockquote>

[QUOTE="Englischdude, post: 271349, member: 16372"] Hi Adox66, if it is not shifting with the blower at all, then I would imagine it is some oil or other contamination adhered to the sensor surface, from the shutter mechanism for example. As the camera is only 5 weeks old it may be that you can get it cleaned under warranty, take it in to where you bought it and ask, if they try to charge you for he service make a scene and play your "only 5 weeks old for heavens sake" card. If you can make another shot of the sky at the HIGHEST F-number, so the smallest aprture, then the contamination will be easier to define. I totally support you learning to clean the sensor yourself. It really is not that hard, and if the D7100 is like my D7000, you are not cleaning the sensor directly, but rather the low-pass filter, which is a glass filter covering the sensor. Many make a big deal about cleaning the sensor but it is not that hard. Another thought, the D7100 should have a clean function in the menu, try that and see if the contamination shifts. For info on how to do this on your camera, read the manual. Any further questions please post. For cleaning the sensor I use the Sensorwand, with PECPADS and eclipse fluid. Please let us know how it goes. Regards Martin [/QUOTE]

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