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Canon EOS 1D X Mark III vs Canon EOS 1Ds: read noise comparison

Canon EOS 1D X Mark III

The Canon EOS 1D X Mark III was measured at 35 ISO settings from ISO 50 to ISO 819200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.17 DN, or 7.4 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 102400 don't change analog gain (digital push). Full well at base ISO is about 100,481 electrons; unity gain is around ISO 630.

Canon EOS 1DsDxO

The Canon EOS 1Ds was measured at 5 ISO settings from ISO 100 to ISO 1250. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (100) read noise is 2.27 DN. From ISO 400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Canon EOS 1D X Mark III vs Canon EOS 1Ds read noise table

ISOCanon EOS 1D X Mark IIICanon EOS 1Ds
501.165–
1001.1732.266
1251.705–
1601.705–
2001.6472.888
2502.266–
3201.548–
4001.6134.563
5002.282–
6403.138–
8002.6038.754
10003.458–
12504.59513.548
16004.857–
20006.233–
25007.945–
32008.515–
400010.556–
500013.642–
640013.929–
800017.268–
1000021.706–
1280026.538–
1600033.128–
2000041.643–
2560052.710–
3200065.799–
4000083.286–
51200106.891–
64000133.436–
80000167.730–
102400213.783–
204800306.555–
409600537.455–
8192001,128.351–

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Data: Photons to Photos · © William J. Claff