You might want to edit your post.
A guy on another forum recently got taken to the cleaners for defaming a brand name. Especially considering the problem was not with the lens.
It essentially comes down to "you get what you pay for". I had similar issues with a 75-300mm lens, and it was annoying, to say the least.
David is 100% correct in his assertion that the prosumer bodies have superior focus systems, and that an f/4.5-f/5.6 lens is going to struggle with focus on the long end. The resulting images will be soft, especially handheld.
Regards,
Humayun
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