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When will Sigma and/or Tamron produce RF lenses?

Started Jan 15, 2020 | Polls thread
Absolutic
Absolutic Veteran Member • Posts: 5,597
Re: When will Sigma and/or Tamron produce RF lenses?

Sorry to resurrect this old thread, but in light of Viltrox decision to discontinue RF mount products after Canon demand, I am curious about the following questions, then answers to which I could not find by googling them:

Canon EF mount was introduce in 1986.   What year did Tamron and/or Sigma introduced the first EF mount lens (any kind, manual or autofocus)?  Did Tamron/Sigma have to wait the entire 15 or so years for Canon EF patent to expire?

If anyone knows, let me know.  I could not find the info what were the first Tamron/Sigma EF products and when they came out.

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