Będzie możliwe tylko i wyłącznie ręczne ustawianie ostrości.

https://www.tamron.eu/pl-PL/serwis/compatibility

Unfortunately we will not be able to offer a firmware update for the following Tamron lenses (Canon mount) (Operation on EOS R/RP via the connection adapter is only possible in manual focus mode MF)*:

• SP AF 28-75mm F/2.8 XR Di LD Aspherical [IF] MACRO (Model A09)

* With latest firmware version. Check/update only via Tamron Service