Got it 2 months ago and only took a few test shots in home, never used outside. Bring in your camera and test it and buy it. You can't tell it is different from a new one.
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Price if firm. Cash and pickup in a public place --- a bank branch parking lot.
Reason for sale: got a 300mm f/2.8 a few days after this 70-200m f2.8 lens and want to keep a less expensive 70-200mm f4 and 300mm f2.8 for my new interests of birds and nature.