Hi, I am beginning to have doubts about the dust alert function on my K-5. This morning I decided to check the sensor for dust. I had no reason to suspect that there was anything wrong, but this afternoon I will be going out for some image hunting. Running the dust alert, showed several, no numerous dust streaks all over the sensor. So I ran the dust removal routine and check again. Still lots of apparent dust but in a different place this time. Mirror up and a good blow out with a Rocket blower and repeat the process. Still showing dust, but moving around. If this is for real, it does not look like sticky stuff (Pollen?) as that would stay put in one place. So I repeat the blower and check again. This time it says it has almost gone, so another couple of sensor shakes and check. But it is saying more than last time. I then set the camera up facing a reasonably clean white emulsion painted wall in the house, check that the focus is spot on and take a couple of shots in RAW. I load these into ACR, convert to psd's and then pixel peep at 100%, scanning across the image from top to bottom. There is no sign whatsoever of dust bunnies or hairs or anything else. I did spot a couple of blemishes that might have been dust, but I checked the wall and they were there for real. What is going on do you think? Is the 'Reveal Dust' routine ultra sensitive to the point where is sees dust that is not apparent on an image, or is it unreliable? Since I have had this camera, I have only twice spotted small circular dust bunnies on an image and they were removed by shaking the sensor a couple of times. I have never had to clean it in any other way, so I have not introduced contaminants and I'm very careful when changing lenses. I'm a bit puzzled to be honest. I suppose the thing to do is ignore it and carry on if there is nothing to be seen in the images, but of course, if a potential buyer or a camera dealer taking it in part exchange ran this routine, it could cost me money or a lost sale. Sometimes I wonder if the technology isn't just a wee bit too clever for its own good. Any thoughts?