Editorial Policy

Last updated: October 15, 2026

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Sony FX3 Memory Cards: When V30 SD Works and When You Need CFexpress Type A

Photo: Henry Söderlund, Wikimedia Commons , CC BY 2.0. Choosing a memory card for the Sony FX3 is more complicated than buying the fastest card you can find. The camera accepts both SD cards and CFexpress Type A cards in either slot, but the card required changes with the recording format, bitrate, frame rate, and whether proxy recording is enabled. My current kit includes an Angelbird AV PRO CFexpress Type A 1TB card, SanDisk Extreme 512GB V30 cards, and SanDisk Extreme PRO V30 cards in 256GB and 64GB capacities. They do not all serve the same purpose. Here is the simple way I separate their roles. The Short Answer V30 SD cards: useful for supported lower-bitrate recording, including certain modes at 200 Mbps or below. V60 SD cards: the practical minimum for many XAVC HS 4K and XAVC S 4K settings above that range, up to 280 Mbps according to Sony's compatibility table. V90 SD cards: required for XAVC S-I 4K and XAVC S-I HD recording when using SD media, as well as some high...

Sony FX3 Dual-Slot Recording: Simultaneous vs Relay and What It Really Protects

The Sony FX3 has two media slots, and each slot accepts SD cards or CFexpress Type A cards. That flexibility is useful, but two cards do not automatically mean the footage is backed up. The protection depends on how Recording Media settings are configured. This guide explains Sony's published recording behavior. The illustration is conceptual, not a photograph of the FX3 menu or its card slots. The Short Answer Simultaneous recording writes the movie to both cards. It creates in-camera redundancy against a single-card failure. Relay recording uses the second card after the first can no longer record, usually because it is full. It extends continuity, but it does not create a duplicate. Standard recording writes to the prioritized slot and provides neither duplication nor automatic capacity extension unless Auto Switch Media is enabled. For an interview, ceremony, or one-time event, simultaneous recording is usually the safer choice. For a long controlled recording where maximum ...

Sony FX3 Proxy Recording Explained: When Smaller Files Save Editing Time

Proxy files are lightweight editing copies recorded alongside higher-quality originals. They can make demanding footage easier to review and edit, especially on complex timelines. What a Proxy Does A proxy reduces the decoding and storage-speed burden during editing. The editor links the smaller file to the original and uses the full-quality media for final output. A proxy is not a backup and should not replace the camera original. When It Helps Proxies are useful for HEVC footage, multicamera projects, remote collaboration, travel editing, or timelines with many effects. A powerful computer may play the originals smoothly, but proxies can still improve battery life and consistency on large projects. Important Limits Proxy availability depends on the selected recording format and settings. Proxy recording can also change memory-card requirements. Confirm Sony’s current compatibility table before assuming an existing V30 card will support the combination. Safe Workflow Copy the complete...

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