Yes, the Canon EOS R3 is compatible with the Transcend 700S V90 128GB.
Canon EOS R3 Slot 2 accepts SD UHS-II. Transcend 700S writes at 250 MB/s (V90) — meets all SD-recordable modes on the R3 including 4K 29.97fps ALL-I and Full HD 239fps slow-motion (requires V90).
“[200 MB/s or higher] Video Speed Class V90 or higher”
Last verified:
Confidence: inferred