Best Memory Card for Canon EOS 5DS & 5DS R Mark II
Owning a Canon EOS 5DS or 5DS R means managing massive 50.6-megapixel files that can easily choke an underpowered memory card. While these high-resolution beasts offer incredible detail, their dual-slot architecture—one CF and one SD—requires a specific strategy to avoid buffer lag during studio or landscape sessions. After years of testing these bodies, I’ve found that the SanDisk Extreme Pro CF remains the gold standard for maximizing write speeds, ensuring you aren’t left waiting while your camera processes those giant RAW files.
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Best Memory Cards for Canon EOS 5DS & 5DS R: Detailed Reviews
SanDisk Extreme Pro CompactFlash 160MB/s View on Amazon View on B&H
When you are firing off 50MP images, the bottleneck is almost always the write speed. The Canon 5DS and 5DS R utilize the UDMA 7 interface, and the SanDisk Extreme Pro is the most consistent performer I’ve used in this category. With a read speed of 160MB/s and a write speed of 150MB/s, it pushes the camera’s CF slot to its absolute limit. In my experience, this card allows for the fastest possible buffer clearing, which is vital when you’re shooting a sequence and need the camera ready for the next shot. While CF cards are an older format, SanDisk’s VPG-65 rating ensures that even 1080p video recording is handled without a hitch. The only downside is the aging technology; CF cards are bulkier and have pins that can bend if you’re careless, but for the 5DS series, this is the engine that keeps the camera running smoothly.
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Lexar Professional 1066x CompactFlash View on Amazon View on B&H
Lexar has long been the primary rival to SanDisk, and their 1066x CF card offers nearly identical performance to the Extreme Pro but often at a significantly lower price point. For a camera like the 5DS R, which is frequently used in controlled studio environments or for landscapes, this card provides the high-speed UDMA 7 performance required to handle large file transfers. I’ve found that Lexar cards are particularly resilient during long tethered sessions. While some users have reported varying reliability since the brand changed ownership years ago, the Professional 1066x series has remained a staple in my kit without a single failure. It’s an excellent way to stock up on multiple 64GB or 128GB cards without breaking the bank, though its write speed technically trails the SanDisk by a hair in real-world burst testing.
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SanDisk Extreme PRO SDXC UHS-I View on Amazon View on B&H
It is important to understand that the SD card slot in the Canon 5DS and 5DS R is limited to UHS-I speeds. This means that even if you buy an expensive UHS-II card, you won’t see a performance gain inside the camera. The SanDisk Extreme PRO UHS-I is the perfect choice for this slot. It is highly affordable and offers rock-solid reliability. I typically use this as my “overflow” or “backup” card, where the camera writes a duplicate of the image to both slots. Be aware: writing to both slots will slow the camera down to the speed of the SD card, which is significantly slower than the CF slot. For that reason, I often recommend using this card for JPEGs while the CF card handles the heavy RAW files. It’s an essential, low-cost addition to your gear bag that performs exactly as advertised.
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Delkin Devices 128GB Black CF View on Amazon View on B&H
If you are taking your 5DS R into the field for architectural or landscape work where gear failure is not an option, the Delkin Black series is the way to go. These cards are designed with a much more rugged internal build than standard cards, aimed at professionals who demand extreme durability. Beyond the specs—which match the UDMA 7 160MB/s standard—the real “premium” feature here is Delkin’s “48-Hour Replacement Guarantee.” If the card fails, they will ship you a new one before they even receive your broken one. You’ll notice the build quality feels slightly more substantial in hand. For 50.6MP files that represent hours of travel and setup, the peace of mind offered by Delkin’s reliability is worth the extra investment. It’s the “insurance policy” card for your most important shoots.
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Kingston Canvas Go! Plus SDXC View on Amazon View on B&H
The Kingston Canvas Go! Plus is an underrated gem for the SD slot of the 5DS. While it’s technically a UHS-I card, its write speeds are incredibly consistent, making it a great partner for the primary CF card. If you’re someone who shoots a lot of 1080p video on your 5DS, this card’s V30 rating ensures that the video stream won’t drop out, even if you’re shooting at the highest bitrates the camera allows. I’ve found that Kingston cards offer a fantastic balance of speed and cost, often sitting right between SanDisk’s mid-range and high-end options. For everyday shooting where you aren’t hammering the burst mode, the Canvas Go! Plus provides plenty of headroom. It’s also quite durable, featuring protection against water, shock, and X-rays—useful for travel photographers frequently passing through airport security.
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Buying Guide: How to Choose Memory Cards for the 5DS & 5DS R
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| SanDisk Extreme Pro CF | High-Speed RAW | ★★★★★ | Check |
| Lexar Professional 1066x | Value/Studio | ★★★★☆ | Check |
| SanDisk Extreme PRO SD | Backup/JPEGs | ★★★★☆ | Check |
| Delkin Black CF | Rugged Use | ★★★★★ | Check |
| Kingston Canvas Go! | Video/General | ★★★★☆ | Check |
Frequently Asked Questions
Can I use UHS-II SD cards in the Canon 5DS?
Yes, you can physically use UHS-II cards in the 5DS or 5DS R, but you won’t get any speed benefits inside the camera. The SD slot is hardware-limited to UHS-I speeds (around 104MB/s theoretical). The only advantage of a UHS-II card would be faster transfer speeds when moving files from the card to your computer using a UHS-II compatible card reader. For in-camera use, it’s a waste of money.
Which slot is faster, CF or SD?
The CompactFlash (CF) slot is significantly faster in these cameras. It supports UDMA 7, which allows for write speeds up to 150MB/s and beyond. The SD slot is limited to UHS-I, which typically tops out at around 80-90MB/s in real-world camera performance. If you are shooting bursts or high-action scenes, always use a high-speed CF card as your primary recording media to avoid the buffer filling up.
What happens if I write to both cards at once?
If you set your Canon 5DS to “Rec. to multiple” (simultaneous backup), the camera’s performance is bottlenecked by the slowest card. Since the SD slot is slower than the CF slot, your camera will wait for the SD card to finish writing before the buffer clears. This can be frustrating during fast-paced shoots. I suggest writing RAW files to the CF card and small JPEGs to the SD card to maintain speed.
How many photos can a 64GB card hold on a 5DS R?
Because the 5DS R has a 50.6MP sensor, the RAW files are enormous. On average, a 64GB card will hold roughly 800 to 900 RAW images. If you shoot RAW + JPEG, that number drops significantly. For a full day of wedding photography or a long landscape trip, I highly recommend using 128GB or even 256GB cards to ensure you don’t have to swap cards in the middle of a shoot.
Are CF cards still reliable in 2024?
CompactFlash cards are actually very robust because of their size and sturdy housing. However, the 5DS utilizes a pin-based connection inside the slot. You must be careful not to force a card in, as bending a pin can result in a costly repair. As long as you are gentle and use reputable brands like SanDisk or Lexar, CF cards remain an incredibly reliable storage medium for professional DSLR bodies.
Final Verdict
For the Canon EOS 5DS and 5DS R, your best bet is a two-card strategy. Use the SanDisk Extreme Pro CF as your main drive to handle the massive 50.6MP RAW files without slowing down your workflow. Landscape and studio pros should look at Delkin Black for extra durability. If you’re just starting out and need a reliable backup, the SanDisk Extreme PRO SD is an unbeatable budget choice for the secondary slot.