Wed 06-Feb-13 10:36 AM | edited Wed 06-Feb-13 10:37 AM by JohnE Nikon
I had something like this which removed with a brush. I would not get worried it will definitely come off. I found more dust last night but tested for it, meticulously. My sensor is now nearly completely clean. I did one wet cleaning. But the particle that looked liked yours came off before resorted to wet cleaning. I do think that people get overly anxious about wet cleaning. After you do it once anxiety will go away.
"Cameras and lenses are simply tools to place our unique vision on film. Concentrate on equipment and you'll take technically good photographs. Concentrate on seeing the light's magic colors and your images will stir the soul." Jack Dykinga