Best CFexpress Type B Cards for Canon Cinema EOS C400
The Canon Cinema EOS C400 is a 6K powerhouse, but its high-bitrate Cinema RAW Light and 4K 120p recording modes demand more than just any storage media. If your card can’t maintain high sustained write speeds, you’ll face dropped frames or mid-take stoppages. I’ve tested various media with the C400’s BSI sensor to find the most reliable options. While many cards claim high peak speeds, the ProGrade Digital Cobalt remains my top pick for its unflinching sustained performance during long interview takes.
Our Top Picks at a Glance
Best CFexpress Type B Cards for Canon Cinema EOS C400: Detailed Reviews
ProGrade Digital Cobalt View on Amazon View on B&H
When you’re shooting 6K RAW on the C400, “peak speed” is a meaningless marketing term—what matters is sustained write speed. The ProGrade Digital Cobalt series is legendary for a reason. It offers a guaranteed minimum sustained write speed of 1400MB/s, which is overkill for the C400’s bitrates, and that’s exactly what you want. I’ve used these cards for multi-hour documentary shoots where the camera runs hot, and I’ve never seen a “Media Full” or “Writing” error. The build quality is exceptional, and they manage heat significantly better than cheaper alternatives. While they are more expensive per gigabyte than the Silver or Gold lines, the peace of mind when filming a once-in-a-lifetime event is worth every penny. If your budget allows, this is the card that ensures your C400 never hits a bottleneck.
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Lexar Professional GOLD View on Amazon View on B&H
Lexar has stepped up their game significantly with the Professional GOLD series. These cards offer a fantastic middle ground for C400 users who need high performance for 4K 120p and 6K RAW but don’t want to pay the “Cobalt” premium. In my testing, the Lexar GOLD maintains impressive speeds that comfortably handle the C400’s Cinema RAW Light (ST and LT) modes. You’ll notice that offloading footage to your PC is also incredibly fast, which is a blessing after a long day on set. The only slight drawback is that they can run a bit hotter than the ProGrade Cobalt during continuous high-bitrate recording, but they remain well within safe operating temperatures. For the price-to-performance ratio, it’s very difficult to beat these cards, making them the ideal choice for corporate videographers and indie filmmakers.
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Sabrent Rocket CFexpress Type B View on Amazon View on B&H
If you’ve just spent a significant amount on the C400 body and need to get shooting without breaking the bank, the Sabrent Rocket is a surprisingly capable contender. While Sabrent is better known for PC SSDs, their CFexpress cards use high-quality flash and controllers. It handles the C400’s XF-AVC modes and even the lower-bitrate RAW modes without breaking a sweat. However, you should be aware that at the lower capacities (like the 128GB or 256GB models), the sustained write speeds are lower than their 1TB counterparts. For the best experience with a C400, I recommend opting for the 512GB or 1TB versions to ensure the card doesn’t throttle during intensive 4K 120p recording. It lacks the ruggedized feel of Delkin or ProGrade, but for indoor shoots or controlled environments, it’s a reliable, wallet-friendly workhorse.
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Delkin Devices BLACK View on Amazon View on B&H
The Delkin BLACK series isn’t just about speed; it’s about industrial-grade reliability. These cards are serialized and undergo rigorous testing before they leave the factory. For the Canon C400, the Delkin BLACK provides a minimum sustained write speed of 1400MB/s (for the latest versions), matching the Cobalt. But the real “premium” feature here is the warranty. Delkin offers a “48-hour replacement guarantee”—if your card fails, they will send you a new one before you even send the broken one back. This is huge for working professionals. The card itself is built to be rugged and resistant to shock and temperature extremes. If you are filming a documentary in the Sahara or a high-stakes commercial where equipment failure isn’t an option, this is the card I’d trust in my C400. It’s a top-tier investment for serious cinematographers.
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SanDisk Extreme Pro View on Amazon View on B&H
SanDisk is the “safe” brand that you can find at almost any camera shop worldwide. The Extreme Pro CFexpress Type B cards are reliable workhorses that I’ve used across various Canon EOS R and Cinema bodies for years. For the C400, they perform admirably in almost all scenarios. While they might not quite hit the sustained write heights of the Cobalt or Delkin BLACK, they are more than capable of handling the 2.1 Gbps bitrates of the C400’s highest RAW settings. I find these cards particularly good for travel because of SanDisk’s global support and the fact that their card readers are ubiquitous. The 512GB and 1TB versions have the best performance profiles. While SanDisk had some issues with firmware on older SD cards, their CFexpress line has been rock solid in my experience, making it a “no-brainer” secondary card to keep in your kit.
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Buying Guide: How to Choose CFexpress Type B Cards
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| ProGrade Cobalt | 6K RAW Workflows | ★★★★★ | Check |
| Lexar Professional GOLD | Mixed Production | ★★★★☆ | Check |
| Sabrent Rocket | Budget Cinema | ★★★★☆ | Check |
| Delkin Devices BLACK | Rugged Use | ★★★★★ | Check |
| SanDisk Extreme Pro | Travel/General | ★★★★☆ | Check |
Frequently Asked Questions
Can I use SD cards for 6K RAW on the Canon C400?
No, the Canon C400 requires a CFexpress Type B card for all Cinema RAW Light recording modes and high-frame-rate 4K. The SD card slot (V90 supported) is limited to XF-AVC proxies or lower-bitrate 4K modes. If you want the full power of the 6K sensor, you must invest in high-quality CFexpress media, as the data rates simply exceed what the SD UHS-II interface can handle.
Does the C400 support CFexpress 4.0 cards?
The C400 uses a CFexpress 2.0 (Gen 3) interface. While CFexpress 4.0 cards are backward compatible and will work perfectly in the C400, they will operate at 2.0 speeds. However, the benefit of using 4.0 cards is that they will offload to your computer much faster if you use a CFexpress 4.0 reader, significantly cutting down your post-production ingest time.
How much 6K RAW footage fits on a 1TB card?
Depending on the flavor of Cinema RAW Light (HQ, ST, or LT), a 1TB card will typically give you between 45 and 90 minutes of footage. At 6K 60p RAW ST, you’re looking at roughly 50 minutes. This is why many C400 users carry multiple 1TB or 2TB cards for a full day of shooting, especially for unscripted or event work.
Are “Gold” or “Silver” cards fast enough for the C400?
Generally, Lexar Gold and SanDisk Extreme Pro are fast enough for most C400 modes. However, “Silver” or entry-level lines often have very low sustained write speeds (sometimes dropping below 200MB/s) which can cause the C400 to stop recording in RAW or 4K 120p. Always check the sustained write spec specifically, rather than the peak burst speed shown on the front.
Should I worry about card heat in the C400?
CFexpress cards naturally get very hot during 6K recording. The C400 has an internal fan and decent thermal management, but some cards dissipate heat better than others. High-end cards like the ProGrade Cobalt or Delkin BLACK use higher-efficiency controllers that generate less heat, which can help prevent the camera from shutting down during extremely long takes in hot environments.
Final Verdict
For the Canon Cinema EOS C400, the choice of media is critical. If you are a professional shooting 6K RAW or high-speed 4K, I strongly recommend the ProGrade Cobalt or Delkin BLACK for their reliability and thermal performance. Those working in corporate or indie film will find the Lexar GOLD to be an excellent balance of speed and cost . Whatever you choose, ensure you have at least 1TB of total storage to handle the massive data rates of this incredible cinema camera.