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You are here: Home / GFX 100S / GFX 100S sensor is a 4-shot stitch

GFX 100S sensor is a 4-shot stitch

April 18, 2021 JimK 10 Comments

This is one in a series of posts on the Fujifilm GFX 100S. You should be able to find all the posts about that camera in the Category List on the right sidebar, below the Articles widget. There’s a drop-down menu there that you can use to get to all the posts in this series; just look for “GFX 100S”.

In the past, the steppers used in sensor photolithography couldn’t cover a 24×36 mm area, and full frame sensors were often stitched using two exposures per sensor during each photolithography step. Because of a discussion on another forum, I decided to take a look.

I took the lens off a GFX 100S, set the ISO to 100, the ES speed to 1/250 second, and banged off 32 exposures. I took one of them into RawDigger, and exported it as a raw composite TIFF. I brought it into Matlab, did a histogram equalization, and looked at each plane. Here they are, a bit less than half size:

R

 

G1

 

G2

 

B

 

It’s pretty obvious that there are four quadrants with somewhat different characteristics. The PDAF rows are pretty obvious, too.

Here’s the code I used for the above:

 

I brought all 32 images into Lr, exported them as layers to Ps, and used Ps to average the layers. Here are the R, G, and B planes of the result:

Red

 

Green

 

Blue

 

If you aren’t doing stacked astro, I don’t think this is of any concern.

The GFX 50R is stitched the same way.

B

 

G1

 

G2

 

R

GFX 100S

← Three dimensionality and sensor format Pixel shift with the Fujifilm GFX 100S →

Comments

  1. Christer Almqvist says

    April 18, 2021 at 1:51 pm

    <>

    But it is interesting.

    Reply
  2. John Leathwick says

    April 19, 2021 at 3:22 am

    And if you are doing stacked astro, a bias frame as widely used in most astro software would presumably deal to it.

    Reply
    • JimK says

      April 19, 2021 at 6:04 am

      Right.

      Reply
  3. Alan Dang says

    April 27, 2021 at 10:05 pm

    Any idea of the GFX100 (original) is a similar 4 panel stich and/or if the linearity is better?

    How would a Phase One 53×40 look? Maybe 6 panels?

    Reply
    • JimK says

      April 28, 2021 at 5:50 am

      The GFX 100 uses the same sensor as the GFX 100S.

      I don’t have an IQ4-150 to test.

      Reply
  4. Chris F says

    April 29, 2021 at 2:18 pm

    Something to back this up:
    https://www.photonstophotos.net/Charts/Sensor_Heatmaps.htm#mode=58,camera=Fujifilm%20GFX%20100,suffix=16

    Reply
  5. Edwin Schottstaedt says

    May 13, 2021 at 5:48 am

    so what about the GFX 50s and 50r are they also staked sensors?

    Reply
    • JimK says

      May 13, 2021 at 2:04 pm

      If you mean stitched, yes.

      Reply
  6. Morgan says

    June 4, 2021 at 8:44 am

    Very interesting, so this is a bit over my head but I am doing stacked Astro and am curious how this effects the result?

    Reply
    • JimK says

      June 4, 2021 at 8:46 am

      You can probably calibrate it out with flat-field correction.

      Reply

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