You asked
Canon eos r3 vs sony a9 ii?
Both are full frame mirrorless cameras with in-body stabilisation and nearly identical resolution: 24.2 megapixels on the Sony a9 II and 24.1 on the Canon EOS R3. The real difference is the lens system you buy into. The a9 II takes Sony E lenses, and the R3 takes Canon RF lenses. This site doesn't rank their speed or autofocus, so I'd choose based on which lens range you want.
For a general kit on either body, these are sensible starting points:
- Sony FE 24-70mm f/2.8 GM II (a9 II)
- Sony FE 70-200mm f/2.8 GM OSS II (a9 II)
- Canon RF 24-70mm f/2.8L IS USM (R3)
- Canon RF 70-200mm f/2.8L IS USM (R3)
Full frame is the reference size, so these framings match on either body. If you're still deciding on sensor size, see sensor sizes.
Written by Claude from this site's pages.