Nikon D810 vs Nikon D810A: read noise comparison

Input-referred read noise at base ISO: Nikon D810 5.9 e⁻ (ISO 64), Nikon D810A 4.7 e⁻ (ISO 200).

Nikon D810

The Nikon D810 was measured at 30 ISO settings from ISO 32 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (64) read noise is 1.23 DN, or 5.9 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 2500 don't change analog gain (digital push). Full well at base ISO is about 75,761 electrons; unity gain is around ISO 300.

Nikon D810A

The Nikon D810A was measured at 26 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 2.48 DN, or 4.7 electrons at the sensor. From ISO 4000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 10000 don't change analog gain (digital push). Full well at base ISO is about 29,631 electrons; unity gain is around ISO 380.

Nikon D810 vs Nikon D810A read noise table

ISO	Nikon D810	Nikon D810A
32	1.173	–
40	1.214	–
50	1.206	–
64	1.231	–
80	1.395	–
100	1.636	2.462
125	1.972	2.445
160	2.329	2.462
200	2.848	2.479
250	3.458	2.908
320	4.228	3.458
400	5.098	4.112
500	6.320	4.891
640	7.674	6.063
800	9.190	7.111
1000	11.158	8.574
1250	13.929	10.411
1600	16.912	12.467
2000	21.259	15.348
2500	24.761	18.507
3200	24.933	21.556
4000	29.243	25.281
5000	36.252	30.910
6400	53.076	37.271
8000	65.799	44.942
10000	81.572	55.715
12800	107.635	75.584
16000	107.635	89.264
20000	133.436	109.896
25600	172.446	146.018
51200	–	282.088

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