Earlier this year, Nikon launched a legal claim against Viltrox in China. The lawsuit alleged that Viltrox had infringed Nikon’s patent for its Z-mount technology. That fight is now over, according to Nikon Rumors, and Viltrox came out on top.
What was Nikon’s lawsuit?
Nikon filed a lawsuit against Viltrox in January 2026 in the Shanghai Intellectual Property Court. The claim alleged that Viltrox had infringed one of Nikon’s patents while that patent was still pending. The patent covered a mechanical interface design for a camera accessory, such as a lens, that mounts to a camera body. Nikon filed it in October 2018 and received the grant in March 2021. Once the grant came through, the company went after Viltrox for backdated royalties covering the period when the patent was pending.
What did the courts decide?
The ruling came from the Patent Re-examination and Invalidation Department of the China National Intellectual Property Administration (CNIPA). Unfortunately for Nikon, CNIPA declared the patent entirely invalid. Viltrox had argued in its defense that Nikon’s claims lacked inventiveness. CNIPA agreed. The technical innovations Nikon claimed were predictable, the department said, and did not involve an inventive step. Nikon’s case collapsed along with the patent.
What next?
Viltrox builds both autofocus and manual lenses for Nikon Z-mount, covering full-frame and APS-C bodies. The company started making Z-mount glass around five years ago. With the patent gone, it can keep producing Z-mount lenses and accessories. Nikon has three months to appeal, so this may not be over.
What we think
Plenty of Z-mount shooters will be relieved. Third-party lenses from companies like Viltrox deliver solid image quality at a fraction of what Nikon-branded glass costs, and a win for Nikon could have pulled them off the market entirely. The ruling may also encourage other third-party manufacturers to build for Z-mount now that royalties and licensing fees are off the table. Whether Nikon takes the loss or fights on is the real question.
