ISO 80 and Dynamic Range

We have just covered the talk about the the new sensor of the Fujifilm GFX100II and the up to twice readout speed.

• Fujifilm GFX100 II Engineers and The Truth About the “New” Sensor and “Up to Twice” Readout Speed

At the end of that article, when I listed the reasons why to get the GFX100II instead of the GFX100S, I wrote the GFX100II has 30% (or 1/3rd of a stop) better dynamic range.

And since I noticed this is another thing that some people struggled with, I decided to elaborate now more in depth.

After testing the dynamic range, Jim Kasson (linked below) agreed that yes, dynamic range is increased, but not by 30%. Jim says:

At ISO 80 those folks at Fujifilm have dropped all the data below the nominal black point, slicing off the left half of the histogram, and cutting the measured read noise in half of what it would normally be. […] You’ll still get slightly improved FWC — but I don’t measure the claimed 30% improvement — and decently low read noise. So it’s an improvement, but not a huge one.

Now, whatever Fujifilm does in terms of software, that has been measured by Jim and I won’t argue that. And it is true that this does make ISO80 dynamic range look crazy good.

But what Fujifilm at the end of the day said, is that there is a 30% dynamic range increase.

What does this mean?

Well, 30% expressed in stops means about 1/3rd of a stop improvement. As a reference, 1 stop increase means doubling the amount of light you let in on the sensor.

So the misunderstand is simple: if the GFX100S has let’s say 14 stops DR, it does not mean that Fujifilm claimed the GFX100II has 18 stops dynamic range (+30%), but 14,3 stops of DR (+1/3). And moreoever, in the X summit the 30% increase is mentioned in the video section of the summit, and Fujifilm has not been clear if it applies also to stills.

What I can say, is that 1/3 DR increase for stills what a Fujifilm rep told me personally during a Fujifilm event. He told me Fujifilm Italy made its own measurements once they got the camera from Japan, and at base ISO they noticed a 1/3 to 2/3 of a stop DR increase.

Now, why did Fujifilm say 30% instead of 1/3rd of a stop, even though they mean the same?

Well, I guess it just sounds better saying 30% rather than 1/3rd of a stop, but of course it can create confusion.

So yes, at base ISO the new Fujifilm GFX100II will give you the better dynamic range over the GFX100S. Also Jim confirms this. But not by a very large margin. Fujifilm says it is 1/3rd of a stop for video, and Fujifilm Italy told me they measured that too for stills.

• Fujifilm GFX100 II – New
  BHphoto / Amazon / Adorama
• GF 55mm f/1.7 R WR – New
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• GF 30mm f/5.6 Tilt Shift – New
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• GF 110mm f/5.6 Tilt Shift – New
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Jim Kasson Articles:

The first stores in Japan have started to mark the Fujifilm GFX50S II as no longer in production, as reported by the Japanese website asobinet.

No longer in production does not mean you won’t find samples anymore around tomorrow. It is more likely that there will be still stable stock for quite some months ahead.

And yet, this news induces me to share some thoughts about the GFX50SII and the GFX system overall.

The GFX50SII was launched back in September 2021.

During these two years, it was often sold with a $800 discount (as right now), showing that the GFX50SII struggled to sell nearly as well as Fujifilm hoped.

The main drawback: the GFX50SII used the old non BSI sensor of the original GFX50S (and the even older Pentax 645Z)  in times when Fujifilm already offered the GFX100 and GFX100S with modern BSI sensor and 100MP. I guess most people decided to go for the more modern and higher resolution models.

In my opinion, the GFX50SII could have sold much better if only Fujifilm would have kept the retro dials layout of the original GFX50S. It would have differentiated it much more from the rest of the lineup.

And overall, the lack of a proper retro styled cameras in the GFX lineup is one of the big mysteries of our time. It’s Fujifilm’s biggest error and an enormous missed opportunity. Especially in times where there is no significant development on the sensor area, the one thing that can really boost sales for a new camera is offering a different shooting experience, which in the GFX world would mean to offer something different than the usual PSAM layout.

Make no mistake: my Fujifilm GFX100S is giving me great joy and it is extremely easy to operate. That’s not the issue. But if Fujifilm would make the camera with exactly the same GFX100S specs but with an X-T layout, I would sell it and go for the Fujifilm GFX100T (imaginary name).

I hope somebody at the higher ranks of the Fujifilm Japan HQ is reading these lines (and they do, they even use FujiRumors surveys for internal meetings).

I know, Fujifilm, you consider PSAM the “safe” approach, as it is more mainstream. But unless you drop a 150MP GFX or a 100MP stacked sensor GFX, you will keep struggling to sell GFX cameras (or be forced to give them huge rebates).

If you decide to stick with the current 100MP BSI sensor (no matter how much you optimise its circuits, AD converters, microlenses, etc), then the best thing to do to create a camera that sells like hot cakes is to offer a different photographic experience. And that camera is called Fujifilm GFX100T or alternatively also the GFX100R.

Trust me on this Fujifilm. Do it, and we will throw our money at you… and my money will be the first to fly to your bank account.