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Last updated: October 22, 2026. Prices change daily, so we link to Amazon instead of quoting them: check current price before you buy.
The memory card is the cheapest part of your kit and the one most likely to ruin a shoot. A card that is too slow makes your camera stop recording, refuse certain video modes, or sit with a blinking "writing" light while the moment passes. The good news: the right card is usually under the price of a lens cap set, and you only need to understand three things on the label.
This guide covers the cards we would actually buy for three very popular cameras: the Insta360 X5 (microSD), the Sony a7 IV (dual UHS-II SD slots, slot 1 also takes CFexpress Type A) and Canon and Sony APS-C mirrorless bodies such as the Canon EOS R50/R10 or Sony a6400/ZV-E10. We also cover card readers, because a slow reader wastes more of your time than a slow card.
The short answer
- Insta360 X5: the Insta360 PRO microSDXC 256GB (V30, made for the camera) or the SanDisk Extreme PRO microSDXC 256GB. Insta360 asks for UHS-I, V30 or faster cards.
- Sony a7 IV (and other UHS-II bodies): the Sony TOUGH-M 128GB V60 or Lexar Gold 1800x V60 for most shooting; a V90 card like the ProGrade V90 2-pack or Sony TOUGH-G 256GB if you shoot the highest-bitrate All-Intra modes.
- Canon / Sony APS-C (R50, R10, a6400, ZV-E10): the SanDisk Extreme PRO 128GB SD. It is the safe default card for 4K on most UHS-I cameras.
- Reader: the Lexar dual-slot USB-C reader handles SD and microSD.
How to read an SD card label (60-second version)
| Marking | What it means | Why you care |
|---|---|---|
| U3 | Minimum sustained write of 30 MB/s | The floor for most 4K video |
| V30 / V60 / V90 | Video Speed Class: minimum sustained write of 30, 60 or 90 MB/s | The number that actually predicts whether video recording keeps going |
| UHS-I vs UHS-II | Bus type. UHS-II cards have a second row of pins | Only faster if your camera and reader support UHS-II; otherwise they run at UHS-I speed |
| A1 / A2 | App performance (random reads/writes) | Matters for phones and some action cams, not for stills cameras |
| "Up to 200 MB/s" | Usually the best-case read speed | Marketing number. Look at V-class for recording |
The rule of thumb: match the V-class to your highest video bitrate, and only pay for UHS-II if your camera has a UHS-II slot. Your camera manual lists the recommended card class for each video mode; when in doubt, follow it.
Best SD card for the Insta360 X5
The X5 records to a single microSD card, and Insta360 recommends UHS-I, V30-rated cards formatted in the camera. High-resolution 360° video writes a lot of data continuously, so the V30 rating matters more than a big "read speed" number on the front.
Our pick: Insta360 PRO microSDXC 256GB. Insta360's own card is V30, A2 and UHS-I, which is exactly the spec the camera asks for, and 256GB is a sensible size for a weekend of 360° clips. There is also a 128GB version if you offload every night.
Alternative: SanDisk Extreme PRO microSDXC 256GB or the Samsung PRO Plus 256GB microSD. Both are well-known V30 cards. If you want a budget backup card, the SanDisk Extreme 256GB microSD is the one most people carry.
Tips for 360° cameras: - Format the card in the camera before the first use, not on your computer. - Two 128GB cards are safer than one 512GB card. If one fails, you lose half a trip, not all of it. - Avoid unbranded "1TB for $15" cards. Fake capacity cards are a real problem on marketplaces; buy listings sold or fulfilled by Amazon or the brand store.
Best SD card for the Sony a7 IV
The a7 IV has two slots: slot 1 takes CFexpress Type A or SD UHS-II, slot 2 takes SD UHS-II. Sony's manual lists which modes need which card class. In short, most XAVC S (Long GOP) 4K recording works on V30 or faster, while the highest-bitrate modes (XAVC S-I All-Intra and some slow-and-quick settings) call for V90 SD or CFexpress Type A.
Best for most people: Sony TOUGH-M 128GB (V60, UHS-II) or Lexar Professional 1800x Gold 128GB (V60, UHS-II). V60 UHS-II cards are fast enough for everyday 4K and high-speed bursts, clear the buffer far faster than UHS-I cards, and cost much less than V90. The Lexar also comes as a 2-pack, which suits the dual-slot backup setup.
Best if you shoot All-Intra or high-frame-rate modes: V90. The ProGrade Digital V90 128GB 2-pack or the Sony TOUGH-G 256GB. These are the cards to buy if you have seen a "card not compatible with this recording mode" message.
Set up the second slot for backup. In the a7 IV menu you can record "simultaneous" to both cards. For weddings, events and travel that is the cheapest insurance you will ever buy.
Best SD card for Canon and Sony APS-C cameras
Cameras like the Canon EOS R50, R10 and Sony a6400 / ZV-E10 are hugely popular first mirrorless cameras. Most of them use a single SD slot. Check your manual for whether your body's slot is UHS-I or UHS-II; if it is UHS-I, a UHS-II card will work but will not be faster in the camera.
Our pick: SanDisk Extreme PRO 128GB SDXC (V30). It is the card most photographers own for a reason: V30 sustained write covers 4K video on these bodies, and 128GB holds a long day of stills and clips.
Budget alternatives: the Lexar Professional Silver Plus 128GB or the Kingston Canvas Go! Plus 256GB (V30). Both are V30 UHS-I cards from established brands.
Do you need UHS-II on an APS-C camera? Only if your camera has a UHS-II slot and you shoot long bursts of RAW. For most beginners, the money is better spent on a spare battery.
Comparison table: the cards in this guide
| Card | Format | Bus | Video class | Best for | Amazon |
|---|---|---|---|---|---|
| Insta360 PRO 256GB | microSD | UHS-I | V30, A2 | Insta360 X5 | Check current price |
| SanDisk Extreme PRO 256GB | microSD | UHS-I | V30, A2 | X5, action cams, drones | Check current price |
| Samsung PRO Plus 256GB | microSD | UHS-I | V30 | X5, phones | Check current price |
| Sony TOUGH-M 128GB | SD | UHS-II | V60 | Sony a7 IV everyday | Check current price |
| Lexar Gold 1800x 128GB | SD | UHS-II | V60 | a7 IV, Canon R6-class bodies | Check current price |
| ProGrade V90 128GB (2-pack) | SD | UHS-II | V90 | All-Intra / high bitrates | Check current price |
| Sony TOUGH-G 256GB | SD | UHS-II | V90 | All-Intra, long events | Check current price |
| SanDisk Extreme PRO 128GB | SD | UHS-I | V30 | R50, R10, a6400, ZV-E10 | Check current price |
| Lexar Silver Plus 128GB | SD | UHS-I | V30 | Budget APS-C | Check current price |
| Kingston Canvas Go! Plus 256GB | SD | UHS-I | V30 | Budget, more capacity | Check current price |
Specs above come from each card's listing and label. Always confirm the exact capacity and class on the listing you buy, since sellers group several sizes on one page.
Don't forget the card reader
A UHS-II card in a UHS-I reader (or your laptop's built-in slot) copies at UHS-I speed. If you bought fast cards, a decent reader is the cheapest speed upgrade you can make.
- Lexar Dual-Slot SD / microSD USB-C reader: one reader for both your camera SD card and your Insta360 microSD.
- UGREEN USB-C 2-in-1 reader: small, cheap, plugs straight into a USB-C phone or tablet for quick sharing.
- Kingston MobileLite Plus microSD UHS-II reader: a pocket microSD reader for action-cam users.
A water-resistant card case is the last piece. Cards are tiny, and the most common way to lose footage is to lose the card.
How many cards and what size?
- Stills only: two 64–128GB cards. Swap at lunch.
- Hybrid stills + 4K video: two or three 128GB cards, or a 256GB in the main slot plus a 128GB backup.
- 360° travel: two 256GB microSD cards, offloaded each night.
Smaller cards spread risk; bigger cards mean fewer swaps. Most working photographers lean toward more, smaller cards.
FAQ
What SD card does the Insta360 X5 need?
It uses microSD, and Insta360 recommends UHS-I cards rated V30 or faster, formatted in the camera. The Insta360 PRO microSD is designed for it; well-known V30 cards from SanDisk and Samsung are popular alternatives.
What is the best SD card for the Sony a7 IV?
For most shooting, a V60 UHS-II SD card such as the Sony TOUGH-M or Lexar Gold 1800x. For the highest-bitrate All-Intra and some slow-motion modes, use a V90 SD card or a CFexpress Type A card in slot 1.
Is V30 enough for 4K?
For most consumer 4K modes, yes. V30 guarantees 30 MB/s sustained write. Very high-bitrate modes need V60 or V90; your camera manual lists the requirement for each mode.
Is UHS-II worth it?
Only if your camera has a UHS-II slot. You get faster buffer clearing during bursts and faster offloading (with a UHS-II reader). In a UHS-I camera, a UHS-II card works but runs at UHS-I speed.
How do I avoid fake SD cards?
Buy from listings sold or fulfilled by Amazon or the brand's own store, avoid deals that look too good to be true, and test a new card's full capacity with a tool like H2testw (Windows) or F3 (Mac/Linux) before an important shoot.
Should I format my card in the camera?
Yes. Format each new card in the camera you will use it in, and reformat (rather than deleting files) after you have backed up.
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Featured photo: Lucas Pezeta / Pexels