Canon EOS 5DS vs Canon EOS 5DS R: read noise comparison

Input-referred read noise at base ISO: Canon EOS 5DS 13.1 e⁻ (ISO 100), Canon EOS 5DS R 13.1 e⁻ (ISO 100).

Canon EOS 5DS

The Canon EOS 5DS was measured at 21 ISO settings from ISO 50 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 5.62 DN, or 13.1 electrons at the sensor. From ISO 2500 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 33,547 electrons; unity gain is around ISO 230.

Canon EOS 5DS R

The Canon EOS 5DS R was measured at 21 ISO settings from ISO 50 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 5.62 DN, or 13.1 electrons at the sensor. From ISO 3200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 33,406 electrons; unity gain is around ISO 230.

Canon EOS 5DS vs Canon EOS 5DS R read noise table

ISO	Canon EOS 5DS	Canon EOS 5DS R
50	5.618	5.502
100	5.618	5.618
125	5.657	5.696
160	5.856	5.776
200	5.938	5.979
250	6.148	6.190
320	6.453	6.589
400	6.916	7.013
500	7.674	7.568
640	8.456	8.398
800	9.781	9.514
1000	11.081	11.236
1250	13.177	13.086
1600	15.455	15.671
2000	19.835	19.160
2500	22.471	22.316
3200	27.858	26.538
4000	34.297	33.359
5000	39.947	38.319
6400	48.840	45.887
12800	96.336	90.510

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