Canon R3 Card Slots: Dual CFexpress Type B Guide
The Canon EOS R3 boasts dual Canon R3 card slots, both CFexpress Type B for blistering 6K RAW video and 30fps burst shooting. No SD compromises here – pro-level redundancy and speed.
Explore specs, compatibility, and why dual slots matter for sports/wildlife pros in 2026.
Dual Slot Specs and Benefits
Slot 1 primary, Slot 2 overflow/mirror.
- CFexpress Type B only (no SD)
- 6.2K 60p RAW internal
- 195MP HEIF bursts
- Backup prevents data loss
Best CFexpress Cards for R3
Speed class 4.0+ recommended.
- Lexar Diamond 4.0 1TB
- Delkin Black 4.0 512GB
- Wise Advanced 2TB
- Angelbird Match Quick 1TB
Slot Configuration Options
Menu-customizable modes.
- RAW to Slot 1, JPEG Slot 2
- Mirror both slots
- Auto switch on full
- Separate video/stills
Firmware Updates and Future-Proofing
2026 outlook strong.
- Firmware 2.0 added proxy recording
- CFexpress 4.0 support rumored
- R3 Mark II may add SD slot 4
- Battery life optimized dual slot