Canon has clamped down tightly on the RF mount, disallowing essentially any third-party lenses with autofocus. This has been to the dismay of many photographers who embraced lenses from companies like Sigma and Tamron, which often offered options that were either cheaper or simply not available from Canon itself. At least one company is still highly interested in the RF mount, as recently confirmed by Sigma's CEO, Kazuto Yamaki.
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