A reported roadmap for Sigma has shown up over at SigmaRumors.com. They're told that Sigma's 24mm f/1.4 ART lens has been delayed until Q1 of 2015. This has been a rumoured lens for quite some time.
Also mentioned are a 14-24mm f/4 Art which makes a lot of sense. Also mentioned is a 16-20mm f/2, which seems a bit constrained on the zoom range, why not just make a 16mm f/2?
Source: [SR]
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