Notably, it's just about the same size as a 70-200/2.8, but superior in practice in almost every respect. It's a full stop faster, which means its better for low light and selective focus. At the long end, 150mm isn't that different from 200mm, and you can always crop. But at the short end, 50mm is significantly wider than 70mm, and there's no way to make a lens wider with cropping.Downside is price, which is, um, high.
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