Canon EOS M100 vs Canon EOS M3: read noise comparison

Input-referred read noise at base ISO: Canon EOS M100 5.9 e⁻ (ISO 100), Canon EOS M3 10.9 e⁻ (ISO 100).

Canon EOS M100

The Canon EOS M100 was measured at 25 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 3.16 DN, or 5.9 electrons at the sensor. From ISO 8000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 29,515 electrons; unity gain is around ISO 190.

Canon EOS M3

The Canon EOS M3 was measured at 22 ISO settings from ISO 100 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 6.82 DN, or 10.9 electrons at the sensor. From ISO 5000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 22,915 electrons; unity gain is around ISO 160.

Canon EOS M100 vs Canon EOS M3 read noise table

ISO	Canon EOS M100	Canon EOS M3
100	3.160	6.821
125	4.170	8.456
160	3.605	5.696
200	4.438	7.260
250	5.816	9.000
320	6.320	6.727
400	7.781	8.515
500	9.849	10.411
640	10.853	9.448
800	13.642	11.713
1000	17.268	14.621
1250	19.293	14.320
1600	24.761	18.001
2000	31.341	22.471
2500	34.776	23.918
3200	44.632	29.446
4000	55.330	37.014
5000	59.714	39.397
6400	76.109	49.867
8000	88.035	61.393
10000	109.896	77.708
12800	138.141	97.006
16000	166.572	–
20000	202.251	–
25600	247.280	–

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