Sony a68 vs Sony a7: read noise comparison

Input-referred read noise at base ISO: Sony a68 3.9 e⁻ (ISO 100), Sony a7 4.4 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

The Sony a7 (ILCE-7) 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 1.21 DN, or 4.4 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 58,090 electrons; unity gain is around ISO 370.

Sony a68 vs Sony a7 read noise table

ISO	Sony a68	Sony a7
50	–	1.206
64	–	1.414
80	–	1.647
100	2.585	1.206
125	2.908	1.395
160	3.458	1.636
200	4.000	1.932
250	4.691	2.313
320	5.657	2.751
400	6.774	3.364
500	8.056	4.084
640	9.849	5.098
800	11.876	6.233
1000	14.320	7.781
1250	17.877	9.580
1600	21.407	12.042
2000	26.909	15.242
2500	34.297	19.160
3200	43.111	24.084
4000	52.346	30.910
5000	67.182	38.319
6400	85.036	48.503
8000	105.420	60.129
10000	134.364	76.639
12800	131.599	97.006
16000	168.897	121.938
20000	210.839	153.277
25600	257.781	156.498

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