Yes, the Canon EOS R3 is compatible with the Sony Tough G 128GB CFexpress Type B.
Canon EOS R3 Slot 1 accepts CFexpress Type B with VPG400 support. Sony Tough G is CFexpress Type B rated VPG400 with 1480 MB/s write — meets all R3 recording modes including 6K RAW (400 MB/s required) and 4K 120fps HFR (400 MB/s required).
“CFexpress memory card Type B VPG400 support SD memory card Compatible with UHS-II”
Last verified:
Confidence: inferred