Best Memory Card for Canon EOS R100
The EOS R100 has one SD slot, and that slot is UHS-I only. 4K at 120 Mbps needs a UHS Speed Class 3 card, and Canon’s own timing table is built on 128GB. The SanDisk Extreme PRO SDXC UHS-I 128GB is a V30, U3 card at that capacity, with a published write speed of 90 MB/s. Check SanDisk Extreme PRO SDXC UHS-I 128GB on Amazon.
Our Top Picks at a Glance
Reviewed September 2026 · one UHS-I SD slot · 4K needs U3 · 6.5 fps
UHS-I, V30, and U3 at 128GB, the capacity Canon timed at about 2 hours 21 minutes of 4K. Write speed is 90 MB/s.
Check Price at Amazon Read full review ↓Same UHS-I V30 U3 class at 64GB, with a published write speed of 120 MB/s. About half the 128GB 4K runtime.
Check Price at Amazon Read full review ↓UHS-I, Class 10, U3, and V30 at 64GB. Kingston rates this capacity at 200 MB/s read and 100 MB/s write.
Check Price at Amazon Read full review ↓This page contains affiliate links. A purchase through those links may earn Cameraegg a commission at no extra cost to you.
| Card | On the EOS R100 | Class and speed | Buy |
|---|---|---|---|
| SanDisk Extreme PRO SDXC UHS-I 128GB | 128GB UHS-I; about 2 hr 21 min of 4K | V30, U3; up to 200 MB/s read, 90 MB/s write | Check price |
| Lexar Professional 1066x SDXC UHS-I 64GB | 64GB UHS-I; about half that 4K time | V30, U3, Class 10; up to 160 MB/s read, 120 MB/s write | Check price |
| Kingston Canvas Go! Plus SDXC 64GB | 64GB UHS-I stills and 4K | V30, U3, Class 10; up to 200 MB/s read, 100 MB/s write | Check price |
| SanDisk Extreme PRO SDXC UHS-I 256GB | 256GB UHS-I for longer trips | V30, U3; up to 200 MB/s read, 140 MB/s write | Check price |
How We Picked
Three sourced facts: the R100 slot and the card class 4K requires, the bit rates and runtimes Canon published, and UHS-I cards whose write speed clears those rates.
- One UHS-I slot, and 4K wants UHS Speed Class 3. Canon EOS R100 advanced user guide: SD, SDHC, and SDXC, UHS-I supported. 4K UHD needs UHS Speed Class 3 or higher. Full HD 59.94/50p and high-frame-rate HD need SD Speed Class 10 or higher. 4K time-lapse needs a read speed of 40 MB/s or higher. Continuous shooting is 6.5 fps in One-Shot AF and 3.5 fps in Servo AF. On a UHS-I 32GB card, Canon lists about 100 or 97 JPEG, 6 RAW, 17 C-RAW, 6 RAW+JPEG, and 13 C-RAW+JPEG.
- 4K is 120 Mbps, and 128GB holds about 2 hours 21 minutes. The same Canon guide: 4K UHD IPB is 120 Mbps (about 861 MB per minute), 35 minutes on 32GB and 2 hours 21 minutes on 128GB. Full HD 59.94p is 60 Mbps. 4K time-lapse ALL-I is 300 Mbps. Each movie clip stops at 29 minutes 59 seconds. 120 Mbps is 15 MB/s. 300 Mbps is 37.5 MB/s. V30 and U3 each mean a 30 MB/s minimum.
- These UHS-I cards publish write speeds above that 37.5 MB/s line. SanDisk Extreme PRO SDXC UHS-I specifications: 64GB and 128GB up to 200 MB/s read and 90 MB/s write; 256GB to 1TB up to 200 MB/s read and 140 MB/s write; V30 and U3. Lexar Professional 1066x SDXC UHS-I: up to 160 MB/s read and 120 MB/s write, Class 10, U3, V30. Kingston Canvas Go! Plus SD (SDG4): 64GB–128GB up to 200 MB/s read and 100 MB/s write, Class 10, UHS-I, U3, V30.
Detailed Reviews
SanDisk Extreme PRO SDXC UHS-I 128GB View on Amazon View on B&H
| Interface | UHS-I |
|---|---|
| Capacity | 128GB |
| Speed class | V30, U3 |
| Read / write | Up to 200 MB/s read, 90 MB/s write |
| Model | SDSDXXD-128G-GN4IN |
Why it fits the EOS R100. The body cannot use UHS-II. This card is UHS-I, and V30 plus U3 is the class Canon asks for at 4K. A 120 Mbps 4K stream is 15 MB/s, inside the 30 MB/s V30 floor. The published 90 MB/s write also clears 4K time-lapse at 300 Mbps (37.5 MB/s), and the 200 MB/s read rating clears Canon’s 40 MB/s read requirement for that mode. SanDisk notes that read speeds past the UHS-I 104 MB/s bus need a compatible reader, so the 200 MB/s figure shows up at the computer, while the camera stays on UHS-I. 128GB is the capacity in Canon’s table: about 2 hours 21 minutes of 4K, or about 4 hours 43 minutes of Full HD 59.94p. Each clip still stops at 29 minutes 59 seconds.
Buy it as the card that stays in the R100. The RAW buffer is still about 6 frames on Canon’s UHS-I test card, so a faster bus will not turn this body into a long RAW burst camera. Leave a UHS-II V90 card for a different camera.
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Lexar Professional 1066x SDXC UHS-I 64GB View on Amazon View on B&H
| Interface | UHS-I |
|---|---|
| Capacity | 64GB |
| Speed class | Class 10, U3, V30 |
| Read / write | Up to 160 MB/s read, 120 MB/s write |
Why it fits the EOS R100. Lexar rates the Professional 1066x series at Class 10, U3, and V30, with write speeds up to 120 MB/s. That is the same class the R100 needs for 4K, and 120 MB/s is above both the 15 MB/s 4K stream and the 37.5 MB/s 4K time-lapse stream. 64GB is half of 128GB. Canon’s 32GB 4K time is 35 minutes and the 128GB time is 2 hours 21 minutes, so 64GB lands near 70 minutes of 4K, enough for two 29-minute 59-second clips. In the camera the UHS-I bus is the limit; the extra read speed is for offload.
Buy it when one or two 4K clips and a few hundred stills are the day. Leave it when the shoot needs the full 128GB runtime.
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Kingston Canvas Go! Plus SDXC 64GB View on Amazon View on B&H
| Interface | UHS-I |
|---|---|
| Capacity | 64GB |
| Speed class | Class 10, U3, V30 |
| Read / write | Up to 200 MB/s read, 100 MB/s write (64GB–128GB) |
| Series | Canvas Go! Plus, SDG4 |
Why it fits the EOS R100. Kingston’s current Canvas Go! Plus SD (SDG4) is Class 10, UHS-I, U3, and V30. At 64GB and 128GB the published write speed is 100 MB/s, which covers 4K at 15 MB/s and 4K time-lapse at 37.5 MB/s. Class 10 also covers Full HD 59.94p and high-frame-rate HD, where Canon asks for SD Speed Class 10. The 64GB capacity is the same size class as the Lexar, with a lower published write speed. Kingston says full read performance needs its MobileLite Plus reader, so the 200 MB/s read is an offload number.
Buy it as the spare UHS-I card, or as the only card when 64GB is enough. Leave a U1 or Class 10 card that is not U3 when the mode is 4K.
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If You Need Something Else
128GB matches the capacity in Canon’s 4K table. A longer trip needs more of the same UHS-I V30 card, not a UHS-II card this body cannot speed up.
SanDisk Extreme PRO SDXC UHS-I 256GB View on Amazon View on B&H
| Interface | UHS-I |
|---|---|
| Capacity | 256GB |
| Speed class | V30, U3 |
| Read / write | Up to 200 MB/s read, 140 MB/s write (256GB–1TB) |
SanDisk rates the 256GB through 1TB Extreme PRO UHS-I cards at up to 140 MB/s write, above the 90 MB/s figure on the 128GB card. 256GB is twice the 128GB capacity Canon timed at about 2 hours 21 minutes of 4K. The slot is still UHS-I, and each clip still ends at 29 minutes 59 seconds. Use this size when the day is several 4K clips plus RAW stills. A UHS-II card does not add speed in this camera.
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Frequently Asked Questions
Why 4K on the R100 needs UHS Speed Class 3
Canon’s card table lists UHS Speed Class 3 or higher for 4K UHD at 23.98 or 25 fps. That mode is 120 Mbps, or 15 MB/s. U3 and V30 both mean a 30 MB/s minimum, which covers it. Full HD at 30 Mbps only needs SD Speed Class 6. High-frame-rate HD at 52 Mbps needs Class 10.
Whether a UHS-II card is faster in the R100
The advanced user guide lists UHS-I support and does not list UHS-II. A UHS-II card will mount and run at UHS-I speed. The V90 rating on that card is unused in this body.
What a 128GB card holds at these bit rates
Canon’s table, approximate: 4K at 120 Mbps is 35 minutes on 32GB, 2 hours 21 minutes on 128GB, and 9 hours 27 minutes on 512GB. Full HD 59.94p at 60 Mbps is 1 hour 10 minutes on 32GB and 4 hours 43 minutes on 128GB. One clip still stops at 29 minutes 59 seconds. High-frame-rate clips stop at 7 minutes 29 seconds.
Why the RAW burst stays near six frames
Canon measured maximum burst on a UHS-I 32GB card that meets its test standard: about 6 RAW, 17 C-RAW, 6 RAW+JPEG, and 13 C-RAW+JPEG, at 6.5 fps in One-Shot AF. JPEG is about 97 to 100 frames. A faster UHS-I write speed can clear the buffer sooner. It does not change the 6.5 fps ceiling, and Servo AF is 3.5 fps.
Whether V30 is enough for 4K time-lapse
4K time-lapse is ALL-I at 300 Mbps, which is 37.5 MB/s. V30’s floor is 30 MB/s, so the class rating alone sits under that stream. Canon also asks for a read speed of 40 MB/s or higher. The cards here publish write speeds of 90 to 140 MB/s and read speeds of 160 to 200 MB/s, which cover both figures. In the camera, the UHS-I bus is the cap.