adaptor question - Canon Ef to sony E full frame (an A7)

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Nov 11, 2020
Rich D
Hope this is the right spot to post.
I have some legacy lenses I would like to try and use on my new A7 (late to the party :) ) some of them from back in the 90's/early 2000's film days! I see theres a sigma convertor, anyone use this or another that can comment on which avenue I should go down?
need one that is like for like, so my 20mm Canon EF lens is 20mm on the Sony, and preferably all electronics work. I also have EF-S lenses, including my holiday Tamron mega zoom which would be nice to carry over.
Any input and advice gratefully received.

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