Fujifilm X-T100 Photographic Dynamic Range (PDR) at PhotonsToPhotos

tradesmith45 wrote:

... For the X-T100, the Shadow Improvement chart shows little shadow improvement

This nearly flat line indicates that the sensor is ISO In-variant:

w/ higher ISO & the Read Noise charts show much higher noise compared to say an X-T20 or X-T2.

As I stated in the original post, and as is evident by the Read Noise in DNs :

The X-T100 does not have dual conversion gain so it does not get the read noise improvement at ISO 800.

Would it be correct to conclude the X-T100 will have much worse S/N for astro imaging than the other 2?

I'm not sure it "much" more. PDR certain falls further behind at ISO 800 and above.

So does a Shadow Improvement of less than 1 EV mean the shadows are suppressed at higher ISO (to reduce noise)? The Canon 6Dii shows much higher than 1 EV shadow improvement w/ higher ISO.

No. Shadow Improvement is primarily indicative of how much read noise is upstream/downstream from the amplifier. The X-T100 is "ISO In-variant" whereas the 6D Mark II is not.

Regarding your request for RAW images for measuring fixed pattern noise, I have an X-T10 similar but not the same as an X-T1. Is that helpful to you?

No. I'm looking for exactly those models.

Is fixed pattern noise included in the read noise charts?

Yes. Read noise is as observed so Dark Signal Non-Uniformity (DSNU), a form of Fixed Pattern Noise (FPN), is included.

The FPN test is summarized on the Sensor Heatmaps page (nothing to do with heat, this form of visualization is called a heatmap.)
For example, here's the X-20 :

Best viewed "Original Size"

The false color is simply to help you see if there are any patterns.
The illuminated test does show some horizontal bands; not bad though.

My simple comparison of FPN - a 2 & 4 min. dark frame boosted 4EV during RAW conversion- shows a substantial difference between the XT10 & my XT2 w/ the later showing fewer pixels w/ FPN but they are much brighter.

In my test the X-T10 looks more vertical while the X-T2 more horizontal.

Best viewed "Original Size"