Re: Is Viltrox Getting Sued? (No more RF-EF Adapters/Speedboosters/Lenses)
Tom_W wrote:
How old was the EF mount before third-party entities started making AF lenses for it? Curious because I'm wondering if it was protected initially by a patent for the first 30 years of its life, before the patent protection ran out.
I really don't know the answer to that - just wondering.
I worked in photo retail in the 90s and remember selling third party AF lenses in Canon EF mount. The EF mount was released in 1987, IIRC. Maybe back then Canon was more permissive or did licensing?
I remember one customer bought a Tokina 80-200/2.8 that didn't work properly on his Canon camera. What we would now consider firmware incompatibility. So it's possible it was reverse engineered rather than licensed because you would expect it to work correctly, if licensed.
Aug 26, 2022 at 04:52 PM
Previous versions of rscheffler's message #16028391 « Is Viltrox Getting Sued? (No more RF-EF Adapters/Speedboosters/Lenses) »
