Dust in lens

[Raptor Reptiles]

HI i would like to know if dust inside a lens has any effect on the final image.I have recently purchased for my 50d an ef 100mm macro and a ef 135mm soft focus that has dust in it.Is it such a bad thing,should i send them to be cleaned? and also how much dust is normal(the seller said some dust is normal in used lens). Best Regards Scott

[old dog]

the seller is right. Most of my lenses have a little spec here and there and I take very good care of them. You will more than likely (and probably never) find that you will not see anything on your images.
I wouldn`t give it another thought.

[Raptor Reptiles]

Thank you for the info i thought they were cheap and only new to photograghy so i purchased them both for $550 (he wanted $700)to have more lens to learn with.They seem to work ok.