Last night I saw a dot in about the last 30 pictures taken. Most of them are obscure in the dark areas, but few are clearly visible. I took the camera to the store an hour ago and he fixed it with the small rubber blower. I asked him if it is my job to do it or is it under warranty? he advised to use blower to clean it, as well he showed me how to do it. But if Iam not so confident to do it just take it to him to do it, he said. How about if the blower failed to fix it? I asked him. That is how far I - as the user - and them as the retailer can do about it according to him. Where the dust came from? You must have opened the lens for some reason. Well yes I did, just for the sake of curiosity. This is bad really. Ok those pictures are not quality pictures, so I am not worry about it. But imagine if you go holiday somewhere and have few hundred pictures taken with dot or dots in them, what do you feel? I think I will buy the cleaning blower and blow it every couple days or so regardless. Better save than sorry don't you think?