Ricoh GR vs Ricoh GR II: read noise comparison

Input-referred read noise at base ISO: Ricoh GR 8.3 e⁻ (ISO 100), Ricoh GR II 4.5 e⁻ (ISO 100).

Ricoh GR

The Ricoh GR 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 0.91 DN, or 8.3 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 37,429 electrons; unity gain is around ISO 910.

Ricoh GR II

The Ricoh GR II 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 0.48 DN, or 4.5 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 38,641 electrons; unity gain is around ISO 940.

Ricoh GR vs Ricoh GR II read noise table

ISO	Ricoh GR	Ricoh GR II
100	0.908	0.480
125	1.007	0.543
160	0.790	0.497
200	0.889	0.616
250	1.050	0.722
320	1.206	0.877
400	1.485	1.110
500	1.753	1.320
640	2.114	1.591
800	2.676	2.056
1000	3.918	2.144
1250	3.784	3.204
1600	5.134	4.317
2000	6.364	6.063
2500	7.727	6.681
3200	9.918	9.126
4000	13.269	11.314
5000	14.929	13.642
6400	18.636	17.268
8000	23.425	21.556
10000	27.858	26.909
12800	36.252	34.535
16000	44.632	42.518
20000	54.569	52.710
25600	69.071	68.594

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