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Max Official Capacity: 512GB – 1TB (Tested up to 1TB)
Setup / Formatting: Format inside Camera Menu before first use
Minimum Speed Class: U3 / V30
Technical Note: 4K video and RAW photo bursts require a V30 sustained write rating so the camera buffer clears quickly.
📋 Official Spec / Manual Source: Sony Official Help Guide — Memory Card Compatibility & Speed Class Chart ↗
Need help formatting or fixing an error? See our guides for Windows 10/11, Mac, Dashcam/Camera Card Error Fix, or Garmin Card Degraded Fix.
Get a 128GB Full-Size SanDisk Extreme or Extreme PRO SD card. Sony Alpha A7 III / A7 IV / A7C / A7R Mirrorless uses a Full-Size SD Card rated U3 / V30. Always use a proper Full-Size SD card rather than a tiny microSD card in an adapter—it prevents your camera from pausing during 4K video or burst photos.
The official maximum supported capacity for Sony Alpha A7 III / A7 IV / A7C / A7R Mirrorless is 512GB – 1TB (tested up to 1TB). For the best balance of price and reliability, our recommended sweet-spot size is 128GB.
64GB ≈ 1,800 RAW photos / 2 hrs 4K • 128GB ≈ 3,600 RAW photos / 4 hrs 4K • 256GB ≈ 7,200 RAW photos. Choosing 128GB gives plenty of headroom without overpaying.
Avoid using microSD-to-SD plastic adapters in mirrorless cameras, as they can cause overheating or write errors. 4K video and RAW photo bursts require a V30 sustained write rating so the camera buffer clears quickly.
Setup requirement: Format inside Camera Menu before first use. Always format a new memory card directly inside the camera's setup menu before your first shoot. This creates the camera's required DCIM directory structure and maximizes continuous burst write performance.
Yes. Unbranded or counterfeit marketplace cards frequently spoof their capacity or fail to sustain U3 / V30 write speeds, leading to corrupted recordings or 'Card Error' warnings. Stick to genuine, branded cards from a reputable retailer to ensure full manufacturer warranty coverage.
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