Why did Sigma announce the Sigma 28-70mm F2.8 DG DN Contemporary lens?

Sigma is a company that makes some questionable choices. We’ll never discount their image quality. But the rest of the package is just always odd. Take the new Sigma 28-70mm f2.8 DG DN Contemporary. For the most part, they say it’s an Art series lens. But the big differences are with the build quality and the focal range.
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