Canon EOS 5DS R vs Canon EOS 600D: read noise comparison

Input-referred read noise at base ISO: Canon EOS 5DS R 13.1 e⁻ (ISO 100), Canon EOS 600D 14.7 e⁻ (ISO 100).

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 600D

The Canon EOS 600D was measured at 7 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 7.84 DN, or 14.7 electrons at the sensor. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 26,796 electrons; unity gain is around ISO 190.

Canon EOS 5DS R vs Canon EOS 600D read noise table

ISO	Canon EOS 5DS R	Canon EOS 600D
50	5.502	–
100	5.618	7.835
125	5.696	–
160	5.776	–
200	5.979	8.398
250	6.190	–
320	6.589	–
400	7.013	10.629
500	7.568	–
640	8.398	–
800	9.514	15.562
1000	11.236	–
1250	13.086	–
1600	15.671	26.355
2000	19.160	–
2500	22.316	–
3200	26.538	48.168
4000	33.359	–
5000	38.319	–
6400	45.887	89.884
12800	90.510	–

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