Originally posted by pschlute You are getting some good advice despite the silly title to your original thread.
It might help if you told us what the lenses are ,and posted some photos to this thread. You need to establish if it is your technique or you have a faulty lens (it does happen).
My experience with the DA* lenses is that they are great lenses, including the 16-50.
Ranters, it helps if you use the 'Quote' button so we can see who you are replying to.
For multiple replies, you can use the 'Multiquote' button.
If you're not sure how to do that, PM me and I'll run through it for you.