Z7 sensitivity versus ISO

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JimKasson
JimKasson Forum Pro • Posts: 38,251
Z7 sensitivity versus ISO
10

Beatboxa asked me to look at the Z7 sensitivity versus ISO to see if there was something funny gong on around the point where the conversion gain changes.

I put a Sigma ART 35 mm f/1.4 lens on a Z7, put the camera on a C1 head on RRS legs, set the exposure mode to manual, aimed the camera at a backlit window shade, defocused the lens as much as I could. I took a shot at 1/20 second. Then I stepped up the ISO in 1/3 stop increments, while I stepped up the exposure speed in 1/3 stop increments.

I brought all the images into RawDigger, set up a selection of a large area near the center of the image, and saved the mean raw values. I averaged all the channels, and computed the error in stops versus a the average of the average.

Here it is:

We're talking about hundreths of a stop here. No big deal.

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 JimKasson's gear list:JimKasson's gear list
Leica Q2 Monochrom Nikon Z7 Fujifilm GFX 100 Fujifilm GFX 100S Nikon Z9 +1 more
Nikon Z7
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