I noticed recently there's what appears to be a fairly large piece of dust (3-4mm when viewed on the LCD screen). The dust spot is maximized at full telephoto and goes away about half way back. I've tried cleaning the lens but that doesn't solve the problem. I've done all I know to do so thought I'd as around and see if anyone has run into this problem or has a solution before I send the camera in to be services. I got the camera less than a year ago.
Thanks.

