Recommended SD Cards
Here are the top-performing or fastest sd cards from the brands we trust. Any of these cards will work great in the Canon SL3 for photos or 4k video. I’ve also listed the speed at which each card performs in-camera.| Card Name | In-Camera Speed | Order |
| Sandisk Extreme Pro 200MBs | 65.5MB/s | Amazon |
| Sony Professional U3 | 70.1MB/s | Amazon |
| Transcend U3 | 67.9MB/s | Amazon |
| Delkin Advantage U3 | 63.7MB/s | Amazon |
| Kingston CanvasG1 A1 U3 | 63.0MB/s | Amazon |
In-Camera SD Memory Card Speed Test
Here is a list showing the in-camera speed of each card. I tested 40 cards, both UHS-II and UHS-I, in the Canon SL3 to see which cards perform the fastest and most reliably. The test involves shooting burst sequences and measuring the time it takes for the buffer to clear.
Canon SL3 Cameras And Buffer Specs
| Sensor: 24.1MP APS-C CMOS Sensor Processor: DIGIC 8 Image Processor Screen: 3.0″ 1.04m-Dot Vari-Angle Touchscreen Video: 4K24p What Is The Bitrate? 120Mbps What Kind Of Memory Card? Single UHS-I Continuous Shoot: 5fps How Big Is The Buffer? 256MB How Many Shots TO Fill The Buffer? 15 ( Sony Professional U3 64GB ) How Long To Clear The Buffer? 2:47 |
What Size Memory Card To Buy, Canon SL3
I typically find 64GB cards perfect for my shooting style. I mostly shoot photos, with a little video here and there. It’s enough to go a day or two without emptying your card, just in case you’re traveling for a weekend or something and don’t have a laptop. For those shooting video, here are some bitrate numbers and shoot durations.Canon SL3 / 250D video bitrate
4k 24p bitrate: 120Mbps 1080 FHD: 60fps 60Mbps or 30fps 30MbpsCanon SL3 Video Bitrate Record Time Chart
| Record Times | 32GB | 64GB | 128GB | 256GB |
| 4k 120Mbps | 38min | 71min | 142min | 284min |
| 1080p 60Mbps | 71min | 142min | 284min | 569min |
| 1080p 30Mbps | 142min | 284min | 569min | 1138min |
Best Memory Cards For 4k Video Canon SL3
Canon cameras are usually known for their high bitrate; it’s the one thing they don’t skimp on, so you will want at least a card rated for U3. This will give you a minimum write speed of 30 MB/s, which is more than enough to handle what the SL3 can output. While some U1 cards will work in the SL3, I wouldn’t recommend them. The SL3 does not have a very large buffer, so it won’t be able to catch hiccups on a poorly performing memory card. Be sure to grab a decent card if the video will be a focus. Grab one of the cheaper UHS-II cards, like the Lexar 1000x, for quick transfer speeds from your card to your computer, assuming you have a UHS-I card reader.Key Takeaways
The SL3 does a really good job of clearing that buffer quickly with UHS-I cards, but the buffer isn’t very large. A quick card can make a difference here, and the camera will feel much more responsive and ready to go after each burst. Most cards from the big brands are pretty good these days; I haven’t really seen any serious issues or bad production runs. Stick with higher-end UHS-I cards rated at least U3 or v30, and you’ll have a very good setup that can handle anything you throw at it.What the 2:47 Buffer Clear Time Actually Means
The SL3’s 256MB buffer holds just 15 RAW frames at 5fps — that fills in 3 seconds. The 2:47 clear time (tested with the Sony U3) means the camera is writing in the background for nearly 3 minutes after a full burst before the buffer is completely empty. In practice you’re not locked out for 2:47 — you can continue shooting single frames — but repeated full bursts will quickly stack the buffer and extend waits. The fastest UHS-I card in the test (Sony U3 at 70.1 MB/s) does this best. A slower card in the 40–50 MB/s range would extend that 2:47 to well over 4 minutes.
For a 5fps camera used primarily for portraits, travel, and casual photography, this is rarely a problem. Where it shows up: kids’ activities, sports sidelines, or anything where you need to fire off multiple rapid bursts in quick succession. The SL3’s small buffer and UHS-I interface are the constraints — a faster card helps, but only at the margins.
Can I Use a microSD Card in the Canon SL3?
The Canon SL3 uses a full-size SD card slot. MicroSD cards work with an adapter, but from experience they can lose connection inside the adapter — I wouldn’t use one for anything critical. See the microSD memory card guide if you need to use one.
Frequently Asked Questions
Does the Canon SL3 support UHS-II cards?
The slot is UHS-I only. A UHS-II card works physically and runs at UHS-I speeds. The benchmark data shows in-camera write speed topping out around 63–70 MB/s regardless of card tier — UHS-II cards offer no advantage inside this camera. They do offer faster USB transfer speeds to your computer if you have a UHS-II reader, but that’s the only benefit.
Does the SL3 have a record limit for 4K video?
Yes — the Canon SL3 has a 4K crop and a roughly 30-minute record limit per clip, which is a Canon firmware limitation common to this era of camera. The card capacity tables above assume continuous recording; you’ll hit the clip limit before filling a 128GB or 256GB card at 4K. For longer takes, you need to restart recording manually or accept the 30-minute chunk limit.
Is a U1 card acceptable for video in the SL3?
U1 guarantees 10 MB/s — which is below the 15 MB/s required for 4K at 120 Mbps. Some U1 cards perform above their rated minimum, but you’re relying on unguaranteed performance. For 1080p at 30 Mbps (3.75 MB/s), U1 is technically sufficient. For 4K, U3 is the right choice and the price difference is minimal.
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