September 26, 2026

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A hand holds a Canon EOS R5 camera body with a large red arrow pointing toward the lens mount.

Thanks to Nikon, Canon’s Closed RF Mount Could Be Forced Open

In January, Nikon sued Viltrox in China, claiming the lens maker had violated its intellectual property for the Z-mount and sought royalties and damages. But this past summer, that court disagreed and ruled in favor of Viltrox. This sets a major precedent that could easily impact Canon, the owner of the only truly closed mirrorless camera mount.