I compare the Nikon D810, Z6 and Z8 for high ISO noise at ISO 800 to 25,600, with sample images. Follow this link to see all the high res JPEG images from this test. You can dow load them for free: https://www.jlvphoto.net/Noise-Test-JPEGS-D810-Z8-Z6
My video response to comments on this video: https://youtu.be/e1x4oqMuH0Y
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