I have a 18-200 VR lens and since the beginning I have been a tad suspicious of its quality. I have a D80 body. I shot a series of pics at 200 mm, 18 and anywhere in between, but only in very few occasions (say 100 shots out of the +5,000 I made with it), does the quality come out unquestionably good. The rest of the pics always clear up a bit after sharpening is added in Lightroom. My 50 mm 1.8 or my 70-300 VR lens give me 100% tack sharp shots, even hand-held at 300 mm. I've read things that hinted at "good" and "bad" lenses, as in quality differences between similar lenses. Basically, I'm trying to determine if I got the "Monday morning" model and I have a shoddily built one. Has anyone dealt with this under warrantee etc.? Feedback appreciated.