08-29-2022 02:10 PM
I was interested to see A POST in DPREVIEW to the effect that Canon had told Viltrox to stop selling Canon RF mount lenses. I went to the lens company's website HERE and there is no listing for Canon RF lenses and, in fact, none for the EF-M mount either.
This information might be useful if someone asks about Viltrox lenses on Canon bodies, as it seems they have stopped producing product.
09-06-2022 11:17 AM
Looks like Canon Germany has identified the issue as patent infringement.
09-06-2022 11:49 AM - edited 09-06-2022 11:51 AM
Then it goes to the court system if they don't respond.
09-06-2022 02:50 PM
Given that Viltrox have withdrawn the RF lenses from the market, it seems they have chosen to avoid litigation, at least for the time being. Given Canon's legal resourcing and experience in patent protection, I would be very surprised if there is a challenge. Still, we shall see...
09-06-2022 05:46 PM
I guess that means all other 3rd parties will not make lenses or adapters for the RF Mount. To avoid litigation against them from Canon.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM
430EX III-RT, 600EX II-RT
09-06-2022 05:58 PM
I don't know. I think it is noemalvfor the OEM to set up licensing and realease IP to allow 3rd parties' gear to work.
09-06-2022 06:07 PM
I thought 3rd parties reversed engineered the electronics in the lens mount to allow AF, IS, aperture control, lens metering and distance info for TTL to work correctly. That's why there are some incompatibilities between old lenses on new bodies.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM
430EX III-RT, 600EX II-RT
09-06-2022 06:16 PM
That might be true to some extent, depending on the agreement with the OEM. Reverse engineering without an agreement would be a breach of patent. You will see that as a standard clause of any product or servise you use. Read a few licesnse agreements for software for example.
09-06-2022 06:42 PM
Yes, reverse engineering violates the license (hardware or software). And once the license is invalid, various consequences would kick in.
09-06-2022 06:27 PM
I have an old Sigma 17-50mm F2.8 EX DC OS HSM which worked fine on my old 40D but when I tried to use it on the 90D it caused an error message. I ultimately bought the 5D Mark IV instead of buying a new APS-C lens. I already owned a few Full Frame L lenses. I get to put them to full use now. Did Canon do the same thing with the EF and EF-S lens mount too. No 3rd parties make EF-S lenses they make EF lenses with an APS-C image circle instead.
-Demetrius
40D, 5D IV, EF 16-35mm F/2.8L III, EF 24-70mm F/2.8L II, EF 28-135mm F/3.5-5.6 IS USM, EF 50 F/1.8 STM
430EX III-RT, 600EX II-RT
09-06-2022 09:51 PM - edited 09-06-2022 09:52 PM
Demetrius wrote: "I thought 3rd parties reversed engineered the electronics in the lens mount to allow AF, IS, aperture control, lens metering and distance info for TTL to work correctly. That's why there are some incompatibilities between old lenses on new bodies. "
The reason that older lenses don't work so well with new bodies is their initial design, including firmware (although in come cases that can be improved for more expensive lenses) and the motor speed to actually achieve focus. Nano-USM motors on the new generations of lenses, for example, are much faster at acquiring focus than older USM motors of generations before. This applies to native lenses as well as 3rd party units.
04/16/2024: New firmware updates are available.
RF100-300mm F2.8 L IS USM - Version 1.0.6
RF400mm F2.8 L IS USM - Version 1.0.6
RF600mm F4 L IS USM - Version 1.0.6
RF800mm F5.6 L IS USM - Version 1.0.4
RF1200mm F8 L IS USM - Version 1.0.4
03/26/2024: New firmware updates are available.
EOS 1DX Mark III - Version 1.9.0
12/05/2023: New firmware updates are available.
EOS R6 Mark II - Version 1.3.0
07/31/2023: New firmware updates are available.
Canon U.S.A Inc. All Rights Reserved. Reproduction in whole or part without permission is prohibited.