Canon EOS 1D vs Canon EOS 1D C: read noise comparison

Input-referred read noise at base ISO: Canon EOS 1D 11.2 e⁻ (ISO 200), Canon EOS 1D C 30.7 e⁻ (ISO 100).

Canon EOS 1D

The Canon EOS 1D was measured at 12 ISO settings from ISO 100 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 2.10 DN, or 11.2 electrons at the sensor. From ISO 500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 1600 don't change analog gain (digital push). Full well at base ISO is about 21,961 electrons; unity gain is around ISO 1070.

Canon EOS 1D CTwin

The Canon EOS 1D C was measured at 31 ISO settings from ISO 50 to ISO 204800. This model has no measurement of its own; the Canon EOS 1D X, which uses the same sensor, is shown.

At base ISO (100) read noise is 5.31 DN, or 30.7 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 51200 don't change analog gain (digital push). Full well at base ISO is about 82,802 electrons; unity gain is around ISO 580.

Canon EOS 1D vs Canon EOS 1D C read noise table

ISO	Canon EOS 1D	Canon EOS 1D C
50	–	5.242
100	1.866	5.315
125	–	5.352
160	–	5.389
200	2.099	5.028
250	2.378	4.959
320	2.676	5.028
400	3.160	5.134
500	3.706	5.315
640	4.500	5.540
800	5.579	5.464
1000	6.821	5.696
1250	8.398	6.063
1600	10.556	6.453
2000	–	6.916
2500	–	7.890
3200	20.535	8.815
4000	–	11.632
5000	–	12.996
6400	–	15.242
8000	–	19.562
10000	–	22.471
12800	–	26.723
16000	–	34.535
20000	–	43.111
25600	–	53.817
32000	–	66.718
40000	–	83.865
51200	–	103.968
102400	–	198.088
204800	–	362.039

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