Understading Photons to Photos graph for my X-S10 (or any other camera)

Tom45 wrote:

So recently I've noticed that casual snap and camera's EV being on 0 just doesn't cut it for some scenes that have a lot of dynamic range, and I'm reading around about it, trying to learn more how to protect the highlights and use the histo.

But also it seems that ISO plays a role and I found the Photons to Photos website and two graphs with X-S10 data plotted.

One is Photographic Dynamic Range vs Iso, another is Photographc Dynamic Range Shadow improvement vs Iso.

I went thru few videos that comment on these graphs for astrophotography but I got lost in the jargon...so to put it simply, what would be the main takeaway for my camera regarding these two graphs?

On the PDR vs ISO graph, there's a slight bump from 400 to 500 ISO, 500 having slightly higher PDR number than 400...what would that signify in real life scenario and use case, should I avoid ISO 400 or something else?

On the other graph, PDRSI vs ISO, ISO 400 has 0.07EV value, ISO 500 has 0.49...again I'm trying to understand what does that imply.

If someone can simplify this to me, would be grateful thanks

I wouldn't spend too much time looking at the exact numbers. That page has more use when you compare cameras IMO.

At the end, what you have to do is try to use as low ISO as posible while avoiding clipping highlights (shadow recovery is awesome nowadays). If you believe the scene requieres more dinamic range, just use exposure bracketing to merge in post.