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We have been told that SIGMA is actively working on an RF mount lens roadmap and will announce their plans sometime in early 2020, I would suspect an announcement ahead of CP+ in February would be the ideal time to do so.
Apparently distributors have received some early information about SIGMA’s plans, but our source on this one didn’t want to divulge any more information.
It would be great for the EOS R system if SIGMA gets on board early with compelling lenses.