This page evaluates a third sample of the 100/2.8L IS. This sample was not brand-new, though it looks as if it were. I rented it from LensRentals.com, and LensRentals checks over their equipment carefully before rental.
Like the first two brand-new samples, this third sample of the Canon 100/2.8L IS has an obvious problem, which makes my job easy. Either I have the world’s worst luck with lenses, or Canon quality control is even worse than I had imagined, see Brand-new Blur.
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