Canon EOS 1Ds Mark III vs Canon EOS 200D: read noise comparison

Input-referred read noise at base ISO: Canon EOS 1Ds Mark III 18 e⁻ (ISO 100), Canon EOS 200D 4.6 e⁻ (ISO 100).

Canon EOS 1Ds Mark III

The Canon EOS 1Ds Mark III was measured at 15 ISO settings from ISO 50 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 5.46 DN, or 18 electrons at the sensor. From ISO 800 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 50,669 electrons; unity gain is around ISO 330.

Canon EOS 200D

The Canon EOS 200D was measured at 10 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.27 DN, or 4.6 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 25600 don't change analog gain (digital push). Full well at base ISO is about 31,808 electrons; unity gain is around ISO 200.

Canon EOS 1Ds Mark III vs Canon EOS 200D read noise table

ISO	Canon EOS 1Ds Mark III	Canon EOS 200D
50	5.464	–
100	5.464	2.266
125	6.727	–
160	8.112	–
200	5.979	3.340
250	7.413	–
320	8.938	–
400	7.516	5.657
500	9.383	–
640	11.314	–
800	11.392	11.392
1000	14.420	–
1250	18.126	–
1600	19.973	19.027
3200	40.224	35.261
6400	–	58.081
12800	–	116.970
25600	–	222.861
51200	–	388.023

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