Nikon D700 vs Nikon D70s: read noise comparison

Input-referred read noise at base ISO: Nikon D700 15.7 e⁻ (ISO 200), Nikon D70s 16.1 e⁻ (ISO 200).

Nikon D700

The Nikon D700 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 (200) read noise is 4.69 DN, or 15.7 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 6400 don't change analog gain (digital push). Full well at base ISO is about 54,675 electrons; unity gain is around ISO 670.

Nikon D70s

The Nikon D70s was measured at 10 ISO settings from ISO 200 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 3.36 DN, or 16.1 electrons at the sensor. From ISO 200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 800 don't change analog gain (digital push). Full well at base ISO is about 19,646 electrons; unity gain is around ISO 960.

Nikon D700 vs Nikon D70s read noise table

ISO	Nikon D700	Nikon D70s
100	4.691	–
125	4.691	–
160	4.691	–
200	4.691	3.364
250	5.856	4.056
320	7.260	4.790
400	5.242	5.816
500	6.543	7.260
640	8.456	9.126
800	6.543	11.392
1000	8.515	13.548
1250	10.853	16.223
1600	13.929	19.698
2000	17.388	–
2500	21.706	–
3200	27.284	–
4000	34.535	–
5000	43.411	–
6400	55.330	–
8000	69.071	–
10000	87.427	–
12800	110.661	–
25600	221.322	–

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