Well, now Viltrox is letting customers know, that Fujifilm X-Pro3 users can return their Viltrox lens. They also say that there is no problem with other cameras, such as the Fujifilm X-T4 and Fujifilm X-T3.
The screenshot above is from an email a FR-reader got from Viltrox.
The reason, so I have been told, is that the location of the lens release button on the Fujifilm X-Pro3 is too close to the bayonet.
Here is what Viltrox writes.
1) Kind Reminder for Fujifilm X-Pro3 Users:
For the sake of your camera, it would be better not use Viltrox 23mm, 33mm or 85mm X mount lens onto Fujifilm X-PRO3 model in case it will damage your camera. Due to the structural conflict, they will scratch a little bit against each other. We apologize for any inconvenience caused!
2) Lens Profiles of Viltrox 85mm f/1.8 STM(E) Lens
For your convenience of lens corrections on Photoshop or Lightroom, we have uploaded Lens Profiles of Viltrox 85mm f/1.8 STM(E) Lens on Vitlrox website www.viltrox.com (Home – Download – Firmware – Upgrading