I just purchased this lens a week ago. I enjoy it (especially for the $$) However, it appears to be extremely loud and has a "click" after the shot. Almost like it gets stuck and just releases late? Is this common or should I be concerned? About a month ago I purchased the D40 and have had a couple problems w/ the 18-55mm lens focusing as well. It clicks and sounds like it wants to focus but wont. Usually after zooming in and/or out, it will fire. Thanks in advance for any input! Cheers