Sony FX3 photo: Henry Söderlund, Wikimedia Commons , CC BY 2.0. 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. The photograph above shows an FX3. The recording behavior below is based on Sony's published documentation rather than a hands-on card-slot test. 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 usu...
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Real-world camera, lens, and filmmaking gear reviews from a New York-based filmmaker.