Lens will get dusty along the time, that's normal. My 24-70L is inthe similar shape too, the dust is quite visible by inspection but does not show on image at all even stopped down. So shouldn't be an issue optically, but I found that I always need to take effort to overcomethis phycologically... And it might affect your resell value if you ever need to put the lens for sale.


Some Sigma lenses, as I have seen, had dust right out of the box. At least Canon doesn't do that very often.[]