Canon EOS M vs Canon EOS M100: read noise comparison

Input-referred read noise at base ISO: Canon EOS M 13.9 e⁻ (ISO 100), Canon EOS M100 5.9 e⁻ (ISO 100).

Canon EOS M

The Canon EOS M was measured at 9 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 8.00 DN, or 13.9 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 12800 don't change analog gain (digital push). Full well at base ISO is about 24,998 electrons; unity gain is around ISO 170.

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 M vs Canon EOS M100 read noise table

ISO	Canon EOS M	Canon EOS M100
100	8.000	3.160
125	–	4.170
160	–	3.605
200	8.515	4.438
250	–	5.816
320	–	6.320
400	10.339	7.781
500	–	9.849
640	–	10.853
800	14.520	13.642
1000	–	17.268
1250	–	19.293
1600	24.084	24.761
2000	–	31.341
2500	–	34.776
3200	41.355	44.632
4000	–	55.330
5000	–	59.714
6400	78.793	76.109
8000	–	88.035
10000	–	109.896
12800	157.586	138.141
16000	–	166.572
20000	–	202.251
25600	290.018	247.280

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