I don't own a R3. So i don't know the file sizes. I own a R6II and a R5. But i shoot cRAW all the time. So i have no idea what the file size should be. Also: noise is a big factor in file size. In my friends case, noise should not be a big factor. She used the R1 outside and it was very sunny. Hmm after re-thinking: her message, that the filesize is 30MB ist very useless