Canon EOS 5D Mark IV vs Canon EOS 5DS: read noise comparison

Input-referred read noise at base ISO: Canon EOS 5D Mark IV 11.5 e⁻ (ISO 100), Canon EOS 5DS 13.1 e⁻ (ISO 100).

Canon EOS 5D Mark IV

The Canon EOS 5D Mark IV was measured at 29 ISO settings from ISO 50 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.69 DN, or 11.5 electrons at the sensor. From ISO 5000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 32000 don't change analog gain (digital push). Full well at base ISO is about 67,871 electrons; unity gain is around ISO 430.

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 5D Mark IV vs Canon EOS 5DS read noise table

ISO	Canon EOS 5D Mark IV	Canon EOS 5DS
50	2.928	5.618
100	2.694	5.618
125	2.848	5.657
160	2.313	5.856
200	2.751	5.938
250	3.160	6.148
320	2.949	6.453
400	3.706	6.916
500	4.170	7.674
640	4.257	8.456
800	5.389	9.781
1000	6.774	11.081
1250	6.964	13.177
1600	8.754	15.455
2000	10.853	19.835
2500	11.959	22.471
3200	14.825	27.858
4000	18.379	34.297
5000	20.252	39.947
6400	25.634	48.840
8000	31.559	–
10000	38.854	–
12800	49.522	96.336
16000	61.820	–
20000	76.639	–
25600	97.006	–
32000	122.786	–
51200	186.108	–
102400	306.555	–

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