New lens, dust inside - some advice needed

[rocdoc]

 

[Garbz]

The new copy is free of any blemishes, and (might be just me)

I give it a week

If you really want to scare yourself take another lens put it on your camera, and then fire your flash through the lens while taking a photo from a 45degree angle. Your lens will light up with crazy dust spots. Dust on or in the lens is rarely if ever even a remote problem. Minor dust from standard lens usage would not even be visible by doing scientific measurements on the final image. So take Derrel's advice and don't look a lens in the mouth

Actually there's one reason to look into the lens and that is for fungus. Fungus can spread, and if it was in there in the past depending on how much of an issue it is it can etch the antiglare coatings off the glass. But fungus is about the only thing you ever need to worry about being in your lens.