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For anyone with a Canon lens collection, the Sigma MC-11 adapter works great with (many)Canon* and Sigma lenses on the A7III.

*EF lenses, can't comment on Canon EF-S personally.

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Try before you buy, if you can. The A7III's auto focus is slower on adapted lenses than on the EF lenses. It's still impressive, but the Alpha + EF combination is compelling.

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