Hi everyone - this is my first post so apologies if this is in wrong area. I have OMD -EM5 and have noticed an artifact appearing on my photos, I suspect it is dust or something on the sensor as changing lens does not cure the problem. I have tried blowing air gently via dust away can on sensor - i'm aware not to blow too close to sensor - however this has not improved the situation. I have attached a couple of photos (JPEGS) and hope somebody will be able to identify the problem. Thanks in advance really loving the OMD.