TREN

Olympus System OM-1 vs Olympus System OM-1 Mark II (HR): read noise comparison

Input-referred read noise at base ISO: Olympus System OM-1 4 e⁻ (ISO 200), Olympus System OM-1 Mark II (HR) 7.8 e⁻ (ISO 200).

Olympus System OM-1

The Olympus System OM-1 was measured at 30 ISO settings from ISO 80 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 0.78 DN, or 4 electrons at the sensor. From ISO 16000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 19,491 electrons; unity gain is around ISO 1010.

Olympus System OM-1 Mark II (HR)

The Olympus System OM-1 Mark II (HR) was measured at 12 ISO settings from ISO 80 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (200) read noise is 1.97 DN, or 7.8 electrons at the sensor. From ISO 1000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 60,830 electrons; unity gain is around ISO 790.

Olympus System OM-1 vs Olympus System OM-1 Mark II (HR) read noise table

ISO	Olympus System OM-1	Olympus System OM-1 Mark II (HR)
80	0.979	2.346
100	0.824	2.028
200	0.779	1.972
250	0.877	2.282
320	1.035	2.585
400	1.240	3.010
500	1.464	3.434
640	1.705	4.084
800	2.085	4.823
1000	1.705	3.945
1250	2.085	4.891
1600	2.532	5.856
2000	3.031	–
2500	3.681	–
3200	4.563	–
4000	5.540	–
5000	6.681	–
6400	8.282	–
8000	10.411	–
10000	12.641	–
12800	16.111	–
16000	15.780	–
20000	19.160	–
25600	24.590	–
32000	30.910	–
40000	38.055	–
51200	49.522	–
64000	60.548	–
80000	74.028	–
102400	98.360	–

Popular comparisons

All cameras · Open the full tool