Hello to all, just new here and say hello. I open with a question for you. I have some spot/marks in my EM-5 pictures (with every lens I use) and that appear more or less strong strictly depending by which f/ I use for shooting: they are strongest at small diaphragm (e.g. f/22) and decrease opening up, at 4.5/f they are pretty neglegible. Looking at the sensor "it seems" clean. I attach here 4 samples just to show them. First at f/22 at f/14 at f/7.1 at f/4.5 Someone have an explanation? Maybe the sensor to clean though it seems OK? Thanks a lot for help me, because this issue it's driving me mad, it ruins a lot of photo.