Sigma 15mm f/1.4 DC DN Contemporary Review: Small Lens, Big Upgrade?

The Sigma 15mm f/1.4 DC DN Contemporary takes over from the long-running 16mm f/1.4 and tightens the formula in ways that affect how you shoot. If you use an APS-C body and want a bright wide angle that balances well and handles video, this one shifts the conversation. 

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