Today I've returned my third sample of the Panny 45-200mm after almost 2 weeks of agony; tomorrow would be the last day to return it. I bought it because I got frustrated with the 45-175mm's double-line issue, but I couldn't get myself to like the 45-200mm. My first sample was good, except for a blob of unsharpness in the lower left corner at 45mm that would slide out of the image by zooming out to 75mm or so. Sold it eventually because of this defect. My second one was reasonably good, but slightly unsharp at the right edge at all focal lengths. Sold it because I bought the X 45-175mm; bad move as it turned out. The third one was sharp across the frame, but had a somewhat high amount of purple fringing that didn't even go away at f/8. I came to the conclusion that the 45-200 didn't bring me a lot over the 45-175mm. The 45-175 has to be used with a shutter speed of at least 1/1000s at 175mm, but is good enough at f/5.6. The 45-200 needs stopping down to f/8 to get good IQ and a shutter speed of 1/500s to get a fair chance of a blur-free image at 175mm. Not very different. And the 45-175 is simply better optically: more sparkle in the images as opposed to the 45-200 which can be greyish, and hardly any purple fringing even wide-open, and less vignetting. And of course the 45-175 is soooo much lighter and smaller . I asked Panasonic Netherlands if it would make sense to send my 45-175mm in regarding the OIS issue. They told me to contact E-Care Repair Services which company obviously takes care of Panasonic's service here. So I did and I'm now waiting for their response. I probably won't buy a fourth 45-200 , I think I'll hold my breath for the Panny 35-100/2.8 and I'll wait this time to see how reviewers and other users fare with it. I bought the 45-175 as soon as it became available, I won't do that again. In the meantime I'll use my Minolta 75-150/4 when I have a tripod with me.