Nikon D7100 vs Nikon D750: read noise comparison

Input-referred read noise at base ISO: Nikon D7100 2.7 e⁻ (ISO 100), Nikon D750 5.2 e⁻ (ISO 100).

Nikon D7100

The Nikon D7100 was measured at 23 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.24 DN, or 2.7 electrons at the sensor. From ISO 100 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 35,974 electrons; unity gain is around ISO 220.

Nikon D750

The Nikon D750 was measured at 29 ISO settings from ISO 50 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.04 DN, or 5.2 electrons at the sensor. From ISO 3200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 8000 don't change analog gain (digital push). Full well at base ISO is about 78,478 electrons; unity gain is around ISO 500.

Nikon D7100 vs Nikon D750 read noise table

ISO	Nikon D7100	Nikon D750
50	–	1.042
64	–	1.050
80	–	1.042
100	1.240	1.042
125	1.693	1.197
160	1.972	1.474
200	2.549	1.729
250	3.317	2.085
320	4.228	2.479
400	4.790	3.031
500	6.063	3.681
640	7.781	4.408
800	9.254	5.315
1000	11.551	6.453
1250	14.723	8.000
1600	18.507	9.714
2000	23.425	12.295
2500	29.446	15.348
3200	36.758	16.450
4000	46.206	20.252
5000	58.081	24.084
6400	73.009	29.857
8000	49.522	36.504
10000	62.250	46.206
12800	78.793	57.680
16000	–	73.009
20000	–	91.773
25600	155.417	114.563
51200	–	187.403

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