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WIth the Tamron 150-600mm and the new Sigma coming out, will Sigma continue producing the 500mm 4.5? I know it's a prime and has 2 stops in favor on the long end so it's apples to oranges. Anyone using the 500mm 4.5? With the 150-600mm you get IS, weather sealing, more reach and possibly the same amount of sharpness?
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