GFX 100S sensor is a 4-shot stitch

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JimKasson
JimKasson Forum Pro • Posts: 32,593
GFX 100S sensor is a 4-shot stitch
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In the past, the steppers used in sensor photolithography couldn't cover a 24x36 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, to.

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:

R

G

B

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

Jim

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Nikon Z7 Fujifilm GFX 100 Sony a7R IV Sony a9 II +1 more
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