Best Memory Card for Canon EOS 5DS R
The Canon EOS 5DS R remains a high-resolution titan, but its 50.6-megapixel sensor demands serious storage performance. Each RAW file can easily exceed 60MB, meaning a slow card will choke your buffer and leave you waiting during critical shoots. Having spent years testing DSLRs, I’ve found that the 5DS R’s dual-slot setup—one CF and one SD—requires a specific strategy. Our top pick, the SanDisk Extreme Pro CF, ensures this high-resolution beast performs at its absolute peak without hesitation.
Our Top Picks at a Glance
Best Memory Card for Canon EOS 5DS R: Detailed Reviews
SanDisk Extreme Pro CF (UDMA 7) View on Amazon View on B&H
When you are pushing 50.6 megapixels through the 5DS R’s dual DIGIC 6 processors, the CompactFlash slot is your best friend. The SanDisk Extreme Pro CF is the gold standard for this camera. Supporting UDMA 7 transfer modes, it hits write speeds of up to 150MB/s, which is vital for clearing the buffer after a 5fps burst of massive RAW files. In my experience, using this card significantly reduces the “busy” light duration compared to even the fastest SD cards in the other slot. It is rugged, temperature-proof, and highly reliable for professional landscape or studio environments. While CF cards are a legacy format, they remain the fastest interface supported by the 5DS R. The only real drawback is the price per gigabyte compared to SD, but for the performance gain in write speeds, it’s a mandatory investment for serious 5DS R users.
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SanDisk Extreme Pro SDXC UHS-I View on Amazon View on B&H
The Canon 5DS R’s SD slot is limited to UHS-I speeds, meaning even if you buy a flashy UHS-II card, you won’t see the benefit inside the camera. That’s why the SanDisk Extreme Pro UHS-I is the smartest value play. It maximizes the camera’s SD interface, providing write speeds around 90MB/s. I frequently use this card for “overflow” or for writing JPEGs to the second slot while RAWs go to the CF card. It’s incredibly reliable and significantly cheaper than CF cards. If you’re a landscape photographer who takes a shot and waits, you might not even notice the speed difference between this and the CF card. However, if you attempt to shoot full RAW bursts to this SD card, you will hit the buffer limit much sooner. It’s a workhorse card that offers the best balance of capacity, speed, and price for the 5DS R’s secondary slot.
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Lexar Professional 633x SDXC View on Amazon View on B&H
For photographers on a tight budget who still need reliable storage for their 5DS R, the Lexar Professional 633x is a solid contender. While it won’t break any speed records with its 45MB/s write speed, it provides a stable environment for single-shot photography. I find this card perfectly adequate for tripod-based architectural work or macro photography where you aren’t firing off multiple frames per second. The 5DS R produces massive files, so having a high-capacity 128GB or 256GB Lexar card is a cheap way to ensure you don’t run out of space in the middle of a shoot. The main limitation is obviously the write speed; if you try to use this as your primary RAW card for action or wildlife, the camera will feel sluggish. However, as a dedicated JPEG-only backup card in the second slot, it’s an absolute bargain that performs reliably under normal conditions.
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Lexar Professional 1066x CF View on Amazon View on B&H
The Lexar Professional 1066x CF card is the primary rival to the SanDisk Extreme Pro, and in some tests, it even edges it out slightly in sustained write performance. This card is built for high-end professional workflows where time is money. With a read speed of 160MB/s, it makes offloading 128GB of 50MP files to your computer a breeze—provided you have a good UDMA 7 card reader. I’ve used these cards in extreme conditions, and they have never failed me. The Video Performance Guarantee (VPG-65) ensures that if you do use the 5DS R for its 1080p video, there will be zero dropped frames. The high-speed UDMA 7 interface is fully utilized here, allowing the 5DS R to breathe. It’s a premium product with a premium price tag, but for a $3,000+ camera sensor, it’s the level of quality you should expect to pair it with.
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Kingston Canvas Go! Plus SDXC View on Amazon View on B&H
The Kingston Canvas Go! Plus is a fantastic alternative for the SD slot of your Canon 5DS R. While the camera won’t hit the card’s maximum 170MB/s read speed, the write performance is rock-solid at around 90MB/s. What I love about Kingston’s “Canvas” line is the focus on durability; these cards are tested to be waterproof, shockproof, and X-ray proof, making them ideal for travel photographers who might be moving through harsh environments. In the 5DS R, it performs almost identically to the SanDisk Extreme Pro SD, offering a snappy experience for single-frame shooting. It’s also V30 rated, which is more than enough for the 5DS R’s data rates. If you can find this on sale, it is often the best-performing card for the money. Just remember that it’s still limited by the camera’s UHS-I hardware bus, so don’t expect CF-like speeds during burst shooting.
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Buying Guide: How to Choose a Memory Card for Canon EOS 5DS R
Comparison Table
| Product | Best For | Rating | Price |
|---|---|---|---|
| SanDisk Extreme Pro CF | Maximum Performance | ★★★★★ | Check |
| SanDisk Extreme Pro SD | Value/Secondary Slot | ★★★★☆ | Check |
| Lexar Professional 633x | Budget Backup | ★★★★☆ | Check |
| Lexar Professional 1066x | Pro Workflow | ★★★★★ | Check |
| Kingston Canvas Go! Plus | Rugged Use | ★★★★☆ | Check |
Frequently Asked Questions
Does the Canon 5DS R support UHS-II SD cards?
Technically, yes, you can use UHS-II cards in the 5DS R, but the camera lacks the physical second row of pins required to utilize the extra speed. The card will default to UHS-I speeds (max ~104MB/s theoretical, usually ~90MB/s actual). You will only see the speed benefit when offloading files to your computer using a UHS-II card reader. For in-camera performance, a fast UHS-I card is much more cost-effective.
Which slot is faster: CF or SD?
The CompactFlash (CF) slot is significantly faster in the Canon 5DS R. It supports UDMA 7, which allows for write speeds up to 150-160MB/s. The SD slot is limited to UHS-I, peaking around 90MB/s. If you are shooting high-resolution RAW files and want to minimize buffer lag, the CF slot should always be your primary choice for recording data.
How many photos can I fit on a 128GB card?
With the 5DS R’s 50.6MP sensor, RAW files average around 60MB to 70MB each. On a 128GB card, you can expect to store approximately 1,600 to 1,800 RAW images. If you shoot RAW + JPEG Large, that number drops to about 1,200 images. For a full day of professional shooting, I highly recommend carrying at least two 128GB cards or a single 256GB card.
Does using two cards at once slow down the camera?
Yes, it can. If you set the camera to “Record to Multiple” (writing the same file to both slots for backup), the 5DS R will operate at the speed of the slowest card. Since the SD slot is slower than the CF slot, your buffer will clear at SD speeds. For the best performance while maintaining a backup, I recommend writing RAW to the CF and a small JPEG to the SD.
Is CompactFlash a dead format?
While newer cameras have moved to CFexpress, the standard CompactFlash (UDMA 7) is still very much alive and supported. It remains the most reliable and fastest way to get data out of professional DSLRs like the 5DS R and 5D Mark IV. You can still easily find high-quality CF cards from major manufacturers like SanDisk and Lexar, though they are becoming more expensive per GB than SD cards.
Final Verdict
For the professional photographer utilizing the Canon EOS 5DS R, the SanDisk Extreme Pro CF is the only card that truly keeps up with the massive data throughput of the 50.6MP sensor. If you’re a landscape photographer working from a tripod, you can save money by using the SanDisk Extreme Pro SDXC in the secondary slot. For those on a strict budget, the Lexar 633x offers plenty of space for JPEGs or slower-paced shoots without breaking the bank.