Sony a700 vs Sony a77 II: read noise comparison

Input-referred read noise at base ISO: Sony a700 6.3 e⁻ (ISO 200), Sony a77 II 4.6 e⁻ (ISO 100).

Sony a700

The Sony a700 (DSLR-A700) was measured at 19 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 1.28 DN, or 6.3 electrons at the sensor. From ISO 250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 3200 don't change analog gain (digital push). Full well at base ISO is about 19,384 electrons; unity gain is around ISO 980.

Sony a77 II

The Sony a77 II (ILCA-77M2) was measured at 28 ISO settings from ISO 50 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.55 DN, or 4.6 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 5000 don't change analog gain (digital push). Full well at base ISO is about 28,645 electrons; unity gain is around ISO 180.

Sony a700 vs Sony a77 II read noise table

ISO	Sony a700	Sony a77 II
50	–	2.676
64	–	2.713
80	–	2.713
100	1.021	2.549
125	1.338	3.010
160	1.495	3.458
200	1.283	3.972
250	1.505	4.691
320	1.840	5.579
400	2.329	6.635
500	2.713	8.112
640	3.605	9.918
800	4.317	11.959
1000	5.169	14.320
1250	6.821	17.148
1600	8.815	20.966
2000	10.196	25.634
2500	13.269	30.910
3200	17.030	38.586
4000	20.252	47.835
5000	26.355	58.892
6400	33.359	58.485
8000	–	74.028
10000	–	93.054
12800	–	92.411
16000	–	116.162
20000	–	144.007
25600	–	183.546

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