Originally posted by Diasfu And I'm the kind of person..if I go out with that lens (ether the 18-200 or 28-300), I would use the whole of the range..for taking all sort of pic.
Well, sure, but the question I am asking is, if you had the 28-300, how often would you be saying to yourself, "damn! I wish this thing went wider"? For most people, the answer would be, about ten times more often than they'd think "damn! I wish wish this thing went longer" while using the 18-200.
That is, I think you're making a mistake in assuming that any tiny difference in image quality is more important than the *huge* difference in focal length range. And the important difference in focal length is the missing wide angle on the 28-300. 28mm was wide angle with film, but it isn't on digital. Unless you have enougn experience to know you never shoot wide angle, I think you'll be frustrated with the 28-300 in way you wouldn't be with the 18-200, because one does wide angle and the other doesn't.