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Fans of ultra-wide optics should take note of Sigma's latest ƒ/1.4 Art-series lens, as the new 20mm ƒ/1.4 DG HSM Art is their widest one yet and thus a prime choice for landscapes as well as astrophotography. Designed for full-frame DSLRs, the Sigma 20mm ƒ/1.4 Art offers a 94.5-degree field of view for a nice, ultra-wide perspective, and its impressive close-focusing capability should allow for some dramatic compositions. The lens is compatible with APS-C cameras, as well, offering an approximately 30mm effective field of view.
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