There is a new report that Sigma is going to make a major RF mount announcement soon (a similar rumor was reported also last year):
One of the sources claims that the Canon EOS R5 has “accelerated” SIGMA’s desire to get RF mount lenses to market sometime in 2021. The same source did say converting current ART series lenses to the RF wasn’t in the cards, and that SIGMA will have a “unique lineup” for the RF mount.
Via CanonRumors
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