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Olympus OM-D E-M10 vs Olympus OM-D E-M10 Mark IV: read noise comparison

Input-referred read noise at base ISO: Olympus OM-D E-M10 6.9 e⁻ (ISO 200), Olympus OM-D E-M10 Mark IV 3.9 e⁻ (ISO 200).

Olympus OM-D E-M10

The Olympus OM-D E-M10 was measured at 23 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 1.15 DN, or 6.9 electrons at the sensor. From ISO 800 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 23,059 electrons; unity gain is around ISO 1200.

Olympus OM-D E-M10 Mark IV

The Olympus OM-D E-M10 Mark IV was measured at 23 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.86 DN, or 3.9 electrons at the sensor. From ISO 2000 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 17,603 electrons; unity gain is around ISO 920.

Olympus OM-D E-M10 vs Olympus OM-D E-M10 Mark IV read noise table

ISO	Olympus OM-D E-M10	Olympus OM-D E-M10 Mark IV
100	1.266	0.807
200	1.149	0.865
250	1.347	1.000
320	1.602	1.181
400	1.292	1.414
500	1.526	1.705
640	1.828	2.056
800	2.219	2.479
1000	2.713	3.010
1250	3.294	3.605
1600	4.112	4.438
2000	5.098	4.317
2500	6.277	5.278
3200	7.890	6.364
4000	9.714	7.890
5000	12.126	9.580
6400	15.242	12.295
8000	19.160	15.562
10000	23.918	19.427
12800	30.065	24.761
16000	38.055	30.484
20000	47.177	39.124
25600	58.081	49.180

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