Fuji extended ISO not at max DR

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Christof21 Veteran Member • Posts: 3,857
Fuji extended ISO not at max DR

Hello,

http://www.photonstophotos.net/Charts/PDR.htm#FujiFilm%20X-T3

Can you explain me why the DR is lower for extended ISO (below base ISO=ISO160), except at ISO 80 ?

it looks like PDR is equal for

  • ISO126 and ISO251
  • ISO100 and ISO200
  • ISO80 and ISO160

This means that there is 1ev difference. This would mean that this is not optimal at all, because we would expect the DR to be the same than base ISO forf extended ISO.

At lower ISO, we should not loose DR.

How do you explain this anomaly. 2 possibilities. Either the graphs are wrong (which I doubt), either Fuji is wrong (by wrong I mean Fuji has a weird implementation).

What do you think ?

Chris

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