According to Canon Rumors (who are crediting an unknown source), Sigma is readying an RF Mount announcement to capitalize on the excitement surrounding the upcoming Canon EOS R5. While the first actual lenses wouldn’t start shipping until 2021, Sigma wants to “address their plans” for the RF Mount much sooner.
The final bit of information shared by one of these unknown sources is that Sigma is planning to create a “unique” lineup for the RF Mount, rather than converting current ART series lenses like it originally did when rushing lenses out for the Sony E-mount. That would mean more of Sigma’s “DG DN” lenses that are tailor-made for mirrorless, rather than DSLR lenses with an adapter more-or-less soldered on.
Sigma has been known to make amazing Lenses that compete in quality with Canon’s for lesser the price so if this is true, it’ll definitely might be a push for those holding off on jumping on to the mirrorless wagon.
