Canon EOS 6D vs Canon EOS 6D Mark II: read noise comparison

Input-referred read noise at base ISO: Canon EOS 6D 23.9 e⁻ (ISO 100), Canon EOS 6D Mark II 36.5 e⁻ (ISO 100).

Canon EOS 6D

The Canon EOS 6D was measured at 28 ISO settings from ISO 50 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 4.89 DN, or 23.9 electrons at the sensor. From ISO 5000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 25600 don't change analog gain (digital push). Full well at base ISO is about 69,959 electrons; unity gain is around ISO 490.

Canon EOS 6D Mark II

The Canon EOS 6D Mark II was measured at 30 ISO settings from ISO 50 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 7.31 DN, or 36.5 electrons at the sensor. From ISO 10000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 40000 don't change analog gain (digital push). Full well at base ISO is about 79,343 electrons; unity gain is around ISO 500.

Canon EOS 6D vs Canon EOS 6D Mark II read noise table

ISO	Canon EOS 6D	Canon EOS 6D Mark II
50	4.857	7.464
100	4.891	7.311
125	6.063	9.126
160	3.891	6.320
200	4.857	8.000
250	6.148	9.987
320	4.347	6.543
400	5.464	8.112
500	6.681	10.339
640	4.925	7.464
800	6.148	9.383
1000	8.000	11.876
1250	6.320	9.580
1600	8.000	12.210
2000	10.056	15.348
2500	9.318	14.026
3200	11.632	17.509
4000	14.420	22.162
5000	14.621	25.107
6400	18.001	32.000
8000	22.627	40.504
10000	29.243	40.224
12800	36.504	51.268
16000	46.527	64.445
20000	57.282	80.449
25600	71.012	103.250
32000	–	129.787
40000	–	164.279
51200	140.070	203.657
102400	257.781	362.039

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