S5 base/native ISO

Started 2 months ago | Discussions thread
Off The Mark Veteran Member • Posts: 6,634
Re: S5 base/native ISO

My understanding is that the dual native ISO applies to RAW and Jpg stills, as well as video.

As in the chart you posted, the second native ISO is 2 and 2/3rds stops higher than the normal base ISO. For example, if the picture profile you are using has an ISO of 100, then the second native ISO is 640.

However, I think for RAW, the base ISO is ALWAYS 100 and the second native ISO is ALWAYS 640 regardless of the picture profile.

The reality is that the second ISO only gives about two-thirds of a stop improvement in dynamic range or less noise. So shooting at ISO 640 is about the same as shooting as ISO 400 (maybe 320). But shooting at 640 is NOT the same as shooting at ISO 100.

Please visit Bill Claff's excellent photons to photos website to view dynamic range charts based on ISO. Noise performance should echo the dynamic range performance.

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