This time around when I tested the lens, in the center of the image, the Tamron 200-500mm lens shows lower contrast as well as lower MTF than the Canon lens. You need to remember that you are paying around USD $5000 for the Canon lens so do not expect too much from the Tamron lens. My initial options were the Sigma 50-500mm lens or the Tamron 200-500mm and I went with the Tamron strictly based on weight. They also show that the Tamron does sharpen up a little when stopped down and this applies at all focal lengths. I
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