Sony a68 vs Sony a7 II: read noise comparison

Input-referred read noise at base ISO: Sony a68 3.9 e⁻ (ISO 100), Sony a7 II 5.1 e⁻ (ISO 100).

Sony a68

The Sony a68 (ILCA-68) was measured at 25 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 2.58 DN, or 3.9 electrons at the sensor. From ISO 640 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 23,773 electrons; unity gain is around ISO 150.

Sony a7 II

The Sony a7 II (ILCE-7M2) 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 1.24 DN, or 5.1 electrons at the sensor. From ISO 320 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 20000 don't change analog gain (digital push). Full well at base ISO is about 65,656 electrons; unity gain is around ISO 410.

Sony a68 vs Sony a7 II read noise table

ISO	Sony a68	Sony a7 II
50	–	1.248
64	–	1.395
80	–	1.625
100	2.585	1.240
125	2.908	1.424
160	3.458	1.636
200	4.000	1.879
250	4.691	2.266
320	5.657	2.639
400	6.774	3.249
500	8.056	3.864
640	9.849	4.790
800	11.876	5.897
1000	14.320	7.362
1250	17.877	9.254
1600	21.407	11.551
2000	26.909	14.621
2500	34.297	18.379
3200	43.111	22.943
4000	52.346	29.041
5000	67.182	36.758
6400	85.036	46.206
8000	105.420	58.485
10000	134.364	73.517
12800	131.599	92.411
16000	168.897	116.162
20000	210.839	146.018
25600	257.781	149.086

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