Baba Ganoush said:
I agree with some of the comments here that the 18-55mm kit lens is not nearly as good (i.e., presumably most people mean sharp) as it is sometimes claimed to be. Perhaps I have a bad copy of this lens, but in order to get what I consider to be decent shots with it on my D7000, I have to crank the in-camera sharpening setting on the neutral Picture Control I prefer all the way up to a value of 6. Even then the images are only about half as sharp as those I routinely get with Canon's similarly cheap 18-55 mm kit lens on my old 450D XSi, where I need to do much less in-camera sharpening. I'd like to sell my 18-55 mm lens, but what I can get for it seems such a pittance I don't know that it's worth my time to shop it around. In the meantime, I've bought a 16-85mm lens for my D7000, which has proven to be at least the equal of the 18-55 mm in terms of sharpness, as I had guessed from looking at the MTF curves and as I've confirmed with a number of test shots to compare the two lenses in detail under various shooting conditions. The first lens I bought with my D7000 was the 50mm f/1.8D FX lens, which also gets high marks from many Nikon users, but IMHO that lens is a pretty junky one, too, and a waste of money. (The copy I bought was made in China; the earlier copies that people rave about perhaps was made in Japan and thus of much better quality, which could account for the difference in opinion.)
Maybe your lens front focuses or back focuses?