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Message: <blockquote data-quote="BackdoorArts" data-source="post: 200848" data-attributes="member: 9240">Dust is inevitable with any DSLR, so you need to be prepared for it.  I suspect that's all it is.  As Scott said, shoot against a bright white wall/paper at f22 with the focus set to minimum (autofocus off) and post that.  It should show you where you have dust on the sensor.  Invest in a good bulb blower, lock the mirror up with the camera facing down so gravity is your friend and use the blower to blow the dust off the sensor. Do not use your mouth or compressed air as it can damage the sensor (and your mouth is moist as all get-out).  Then check again.  19 time out of 20 this should remove any problems.  The rest can be handled in post processing until you hit the point where you need a wet clean.  At this point you can learn to do it yourself or find a shop nearby that will do a cleaning for you.</blockquote>