Best Memory Cards for Canon EOS R Mark II
Picking the right memory card for your Canon EOS R Mark II (the R6 Mark II) is the difference between capturing a once-in-a-lifetime 40fps burst and staring at a “Busy” screen while the moment vanishes. With its high-resolution sensor and demanding 4K 60p video, you need a card that keeps up with Canon’s Digic X processor. After testing dozens of UHS-II options, I’ve found that the Kingston Canvas React Plus is the undisputed king for this specific body.
Our Top Picks at a Glance
Best Memory Cards for Canon EOS R Mark II: Detailed Reviews
Kingston Canvas React Plus View on Amazon View on B&H
The Kingston Canvas React Plus is a beast of a card and my personal go-to for the Canon EOS R Mark II. When you’re pushing the camera to its 40fps electronic shutter limit, you need a V90-rated card that won’t choke. In my testing, this card cleared the buffer significantly faster than cards costing twice as much. It handles 4K 60p and even 6K RAW video over HDMI without a hiccup. The cherry on top? Kingston includes a high-speed UHS-II USB reader in the box, which is a massive win for your workflow. While some might prefer the “prestige” of Sony or SanDisk, the performance-to-price ratio here is unbeatable. The only minor drawback is that the labels can sometimes feel a bit thin, but the internals are world-class. If you shoot sports or birds in flight, this is the card you want in Slot 1.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
Lexar Professional 1800x View on Amazon View on B&H
The Lexar Professional 1800x is the sweet spot for 90% of Canon EOS R Mark II users. It’s a V60 card, meaning it guarantees a minimum sustained write speed of 60MB/s—plenty for almost all of the R6 II’s internal video codecs, including 4K 60p IPB. While it isn’t as fast as a V90 card for clearing massive bursts of RAW files, it’s significantly faster than any UHS-I card. I find this card particularly reliable for wedding photography where you’re shooting thousands of frames and need a card that won’t overheat. It’s affordable enough to buy in pairs for the R6 II’s dual slots, ensuring you always have a real-time backup. It does feel slightly slower during file transfers to your computer compared to the Kingston, but for the price, the stability it offers is fantastic.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
SanDisk Extreme Pro UHS-I View on Amazon View on B&H
If you’ve just spent your budget on the EOS R Mark II body and a nice RF lens, the SanDisk Extreme Pro UHS-I is a safe, cheap harbor. Let’s be clear: this card will bottleneck your camera if you try to shoot long bursts of RAW files or use the most demanding video settings. However, for casual travel photography, single-shot portraits, or standard 4K 24p video, it works perfectly fine. I always keep a few of these in my bag as “emergency” cards because they are nearly indestructible and compatible with everything. You won’t get the lightning-fast buffer clearing of a UHS-II card, but you’re getting SanDisk’s famous reliability and a lifetime warranty. It’s an honest card for honest work, just don’t expect it to keep up with the camera’s high-speed sports modes.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
Sony TOUGH-G Series View on Amazon View on B&H
The Sony TOUGH-G series is essentially the “bulletproof vest” of SD cards. If you’re shooting in dusty, wet, or rugged conditions with your EOS R Mark II, this card is worth every penny. It features a monolithic design with no fragile plastic ribs or write-protect switches that can break off inside your camera—a common failure point I’ve seen too many times. Beyond its physical strength, it is incredibly fast, offering 299MB/s write speeds that make light work of the R6 II’s buffer. It’s the most expensive card on this list, but for professional work where data loss isn’t an option, it provides unparalleled peace of mind. I find the lack of a write-protect switch a relief; you never have to worry about accidentally locking the card when sliding it into the slot.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
ProGrade Digital SDXC UHS-II Gold View on Amazon View on B&H
ProGrade Digital was founded by former Lexar executives, and their Gold series cards are masterfully engineered for modern mirrorless cameras. This V60 card is incredibly consistent; it doesn’t suffer from the speed drops that some cheaper brands do during long recording sessions. It’s an excellent companion for the EOS R Mark II’s video capabilities. One unique feature is compatibility with ProGrade’s “Refresh Pro” software, which allows you to monitor the health of your card and “sanitize” it to restore factory-fresh speeds. This is a huge advantage for pros who want to ensure their cards won’t fail during a critical shoot. The build quality is solid, and the thermal management is excellent, keeping the card cool even when the R6 II is working hard. It’s a sophisticated choice for those who value data integrity.
Check Price on Amazon → Check Price on B&H
✓ Free Shipping · ✓ Easy Returns · ✓ Secure Checkout
Buying Guide: How to Choose Memory Cards for Canon EOS R Mark II
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| Kingston Canvas React Plus | Action/Sports | ★★★★★ | Check |
| Lexar Professional 1800x | Events/Weddings | ★★★★☆ | Check |
| SanDisk Extreme Pro UHS-I | Casual/Budget | ★★★★☆ | Check |
| Sony TOUGH-G Series | Extreme Conditions | ★★★★★ | Check |
| ProGrade Digital Gold | Video Professionals | ★★★★☆ | Check |
Frequently Asked Questions
Does the Canon EOS R Mark II require UHS-II cards?
It doesn’t “require” them to function, but it is highly recommended. The EOS R6 Mark II can use UHS-I cards for basic photography, but you will experience significant lag when shooting bursts, and you may be limited in high-bitrate video modes. To unlock the full potential of the 40fps shutter, UHS-II cards are a must-have for any serious user.
What is the difference between V60 and V90 cards?
These ratings refer to the minimum sustained write speed. V60 cards maintain at least 60MB/s, which is sufficient for most 4K video. V90 cards maintain at least 90MB/s and are designed for high-end video like 8K or extremely fast RAW photo bursts. For the EOS R6 Mark II, V60 is usually enough for video, but V90 is better for sports photography.
Can I use two different sized cards in the dual slots?
Yes, you can. However, if you are using the “Record to Multiple” setting for backup, the camera will stop recording once the smaller card is full. For the most seamless experience, it is generally best to use two cards of the same capacity and speed to avoid any confusion or workflow bottlenecks during a shoot.
Why are Sony Tough cards so expensive?
Sony Tough cards use a unique resin-molded design that makes them 18 times stronger than standard SD cards. They are waterproof, dustproof, and ribless. The high price reflects this specialized manufacturing process and the peace of mind they offer professionals who work in demanding environments where a snapped card could mean a total loss of client work.
How many photos can a 128GB card hold on the R6 II?
On the Canon EOS R6 Mark II, a 128GB card will typically hold around 3,000 to 4,000 RAW images or over 10,000 JPEGs. If you use C-RAW (Canon’s compressed RAW format), you can nearly double that photo count without a noticeable loss in image quality. For video, 128GB will give you roughly 40-60 minutes of high-quality 4K 60p footage.
Final Verdict
If you are a professional photographer or a dedicated enthusiast using the Canon EOS R Mark II, don’t handicap your camera with slow storage. For sports and wildlife, the Kingston Canvas React Plus is the clear winner for its speed. For wedding and event shooters, a pair of Lexar 1800x cards offers the best balance of reliability and cost. Whatever you choose, ensure you have enough capacity to handle the R6 II’s impressive data throughput.