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I can go some way to answering .I bought a Canon eos50d with their own 18 to 200 zoom.Initially I was delighted with my shots but gradually I noticed it really struggled at the extremes especially the wide 18mm end where distortion and vignetting are very noticeable.
I now find the only time I use it is when I don't want to lug of stuff around .Otherwise my needs are met by other better and sharper lenses
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