Fixed pattern noise in the a7RIV

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JimKasson
JimKasson Forum Pro • Posts: 26,235
Fixed pattern noise in the a7RIV
7

The Z6, Z7, and the GFX 100 all have fixed pattern noise caused by their attempts to fix PDAF striping. It works, but the cure is worse than the disease. I made 128 dark field  (back of body cap) exposures at ISO 1000 at 1/1000 second. I averaged them, separated out the four raw planes, and histogram equalized them. Here they are:

Red

G1

G2

Blue

Because they're histogram equalized, don't look at the amount of the noise, but rather at its pattern. There is some column variation. That's normal. In all of the planes but the blue one, there is no hint of PDAF banding, and the indications in the blue plane are extremely minor.

I think this is good news, but more testing is in order. The Z6 and Z7 show different amounts of PDAF banding in different circumstances.

Jim

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 JimKasson's gear list:JimKasson's gear list
Nikon D5 Sony a9 Sony a7 III Nikon Z7 Fujifilm GFX 100 +4 more
Nikon Z6 Nikon Z7
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