Philip Bloom confirms the As7III has “Dual ISO”:
And Photographyblog posted the full Sony A7sIII review concluding:
All things considered, the Sony A7S III is the most capable hybrid 4K video camera available today. Crucially for a pro tool, the Alpha 7S III is tough, lightweight and comfortable, its controls are exactly where you want them to be and it completes the job reliably with no performance drawbacks in any scenarios, especially low light.
Regarding features and image quality, the decision to retain the low 12.1MP resolution but on a new back-illuminated sensor has paid off for video and low light shooters.
Those 4K video frame rates are unmatched, as well as the 240fps slow motion Full HD video mode. You also get the best colours, dynamic range and control over noise that we have seen from the Sony A7 range yet.
Overall, Sony has been refreshingly single-minded on delivering a product that truly delivers in real world experience instead of flouting hollow headline grabbing numbers. Yes it’s ‘only’ 4K. Yes, it ‘only’ has 12.1MP. But within those parameters, you’ll be hard pressed to find a better camera than the Sony Alpha 7S III.