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Sony a7 vs Sony a7 II: read noise comparison

Input-referred read noise at base ISO: Sony a7 4.4 e⁻ (ISO 100), Sony a7 II 5.1 e⁻ (ISO 100).

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 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 a7 vs Sony a7 II read noise table

ISOSony a7Sony a7 II
501.2061.248
641.4141.395
801.6471.625
1001.2061.240
1251.3951.424
1601.6361.636
2001.9321.879
2502.3132.266
3202.7512.639
4003.3643.249
5004.0843.864
6405.0984.790
8006.2335.897
10007.7817.362
12509.5809.254
160012.04211.551
200015.24214.621
250019.16018.379
320024.08422.943
400030.91029.041
500038.31936.758
640048.50346.206
800060.12958.485
1000076.63973.517
1280097.00692.411
16000121.938116.162
20000153.277146.018
25600156.498149.086

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Data: Photons to Photos · © William J. Claff