Sony a77 vs Sony a77 II: read noise comparison

Input-referred read noise at base ISO: Sony a77 4 e⁻ (ISO 100), Sony a77 II 4.6 e⁻ (ISO 100).

Sony a77

The Sony a77 (SLT-A77V) was measured at 26 ISO settings from ISO 50 to ISO 16000. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 3.39 DN, or 4 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 5000 don't change analog gain (digital push). Full well at base ISO is about 18,921 electrons; unity gain is around ISO 120.

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 a77 vs Sony a77 II read noise table

ISO	Sony a77	Sony a77 II
50	2.949	2.676
64	3.411	2.713
80	4.000	2.713
100	3.387	2.549
125	3.918	3.010
160	4.757	3.458
200	5.657	3.972
250	6.774	4.691
320	8.225	5.579
400	9.918	6.635
500	12.210	8.112
640	15.032	9.918
800	18.507	11.959
1000	22.943	14.320
1250	29.651	17.148
1600	37.271	20.966
2000	46.851	25.634
2500	58.081	30.910
3200	74.028	38.586
4000	93.054	47.835
5000	115.360	58.892
6400	112.206	58.485
8000	144.007	74.028
10000	181.019	93.054
12800	227.544	92.411
16000	286.026	116.162
20000	–	144.007
25600	–	183.546

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