Canon EOS 1D X Mark III (ES) vs Canon EOS 1Ds read noise comparison

Canon EOS 1D X Mark III (ES)

The Canon EOS 1D X Mark III (ES) 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 3.51 DN, or 22.2 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 100,477 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 (ES) vs Canon EOS 1Ds read noise table

ISO	Canon EOS 1D X Mark III (ES)	Canon EOS 1Ds
50	3.482	–
100	3.506	2.266
125	4.627	–
160	3.918	–
200	3.891	2.888
250	5.063	–
320	4.199	–
400	4.257	4.563
500	5.502	–
640	7.062	–
800	4.891	8.754
1000	6.409	–
1250	8.056	13.548
1600	6.589	–
2000	8.456	–
2500	10.629	–
3200	9.987	–
4000	12.553	–
5000	15.780	–
6400	15.889	–
8000	19.698	–
10000	24.761	–
12800	30.484	–
16000	38.586	–
20000	48.168	–
25600	60.969	–
32000	76.109	–
40000	95.670	–
51200	121.095	–
64000	150.123	–
80000	191.341	–
102400	240.518	–
204800	340.144	–
409600	584.071	–
819200	1,120.557	–

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