Yes, the Canon EOS R8 is compatible with the Sony SF-G Tough 128GB.
Sony SF-G Tough V90 writes at 299 MB/s. Canon R8 4K30 minimum is 30 MB/s (UHS Speed Class 3). Passes with large margin.
“Canon EOS R8 Compatible Cards: SD/SDHC/SDXC with UHS-II and UHS-I supported; for movies use a card with ample performance (fast enough writing and reading speeds) per Canon online manual.”
Last verified:
Confidence: inferred