Sony just announced that their CineAlta F5 and F55 professional 4K camcorders will be getting a significant upgrade soon enabling Cache recording in RAW up to 30 seconds in 24 fps with the help of an optional accessory. The details around this optional accessory are not yet known.
Peter Crithary from Sony announced the new upcoming features on the Sony Pro Community forum also mentioning that it was a feature demanded by Documentary and Wildlife productions using Raw.
This is certainly great news for both F5 and F55 owners, the latter of which will be also able to get 120fps in 4K Raw on their F55's with this new mysterious accessory, which will hopefully be announced officially soon.
We'll keep you updated as to when this happens. In the meantime, for all your Sony F5/F55 or Large Sensor Camcorder needs you can head over to our Sony cameras page on our website here.