Dreaded Monkey Pirate
Join Date: Dec 2002
I've noticed some dust in a couple of my zooms but have yet to detect any loss of detail in photos taken with them. I think it's fairly normal as you mentioned. I would say to keep shooting until it becomes noticable, and unless your printing extremely large prints, I doubt it will ever be a problem. Even then, you could always send the lens in to be cleaned, for a price, of course.
I have also noticed that my lenses which zoom "internally" have less dust than those that zoom "externally". I've heard the "push-pull" zooms are the worst for dust. Something to consider when making your next purchase.
Arrr...JackAxe's wooden leg has termites!!!