A1 dual native ISO values?

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DerrickRR Junior Member • Posts: 41
A1 dual native ISO values?

I know with the A7Siii it is said the second native ISO kicks in 4-1/3 stops above the base ISO.

Does the 4-1/3 formula not apply to the A1? I’ve seen in a number of places that the second native ISO kicks in at 500 ISO for stills. So with the base ISO being 100, this comes out to be 2-1/3 stops. Does this same math apply to video? PP11 (S-Cinetone) has a base ISO of 125. Using the 2-1/3 stops formula would yield a second native ISO of 640.

Am I correct or am I missing something?

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