Testing the camera around the house and noticing this - it seems too sharp to be dust, and if it's a hair a rocket blower is not removing it. See images (centre right). Could it be below the sensor stack, which is why it is in focus almost. It shows lightly at f/7.1 and gets more defined towards f/22. Tested two different lenses, so it is definately camera related. I have contacted my dealer but appreciate any advice. PS camera been babied and only put the 24-70 2.8 on it nothing else, sensor shield is always set to close when off also. I decided to have a quick look at the sensor directly and I can see the little thing, but as I said a rocket blower will not move it and I don't have cleaning swabs with me nor feel confident yet to do that. It is tiny, but hard to see if it is above or below the sensor stack.