Ricoh GR II vs Ricoh GR IV: read noise comparison

Input-referred read noise at base ISO: Ricoh GR II 4.5 e⁻ (ISO 100), Ricoh GR IV 3.3 e⁻ (ISO 100).

Dual gain: Ricoh GR II none, Ricoh GR IV ISO 400.

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 IV

The Ricoh GR IV was measured at 34 ISO settings from ISO 100 to ISO 204800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.01 DN, or 3.3 electrons at the sensor. A second gain (dual gain) kicks in at ISO 400, cutting input-referred read noise by about 1.3 stop. From ISO 3200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 27,054 electrons; unity gain is around ISO 170.

Ricoh GR II vs Ricoh GR IV read noise table

ISO	Ricoh GR II	Ricoh GR IV
100	0.480	2.014
125	0.543	2.395
160	0.497	2.412
200	0.616	2.751
250	0.722	3.411
320	0.877	3.160
400	1.110	1.659
500	1.320	1.959
640	1.591	2.173
800	2.056	2.282
1000	2.144	2.789
1250	3.204	3.182
1600	4.317	4.141
2000	6.063	4.993
2500	6.681	6.105
3200	9.126	7.260
4000	11.314	9.190
5000	13.642	11.392
6400	17.268	13.737
8000	21.556	16.795
10000	26.909	22.009
12800	34.535	25.634
16000	42.518	33.128
20000	52.710	41.933
25600	68.594	53.446
32000	–	66.257
40000	–	89.884
51200	–	104.691
64000	–	135.298
80000	–	168.897
102400	–	215.269
128000	–	265.028
160000	–	326.288
204800	–	418.766

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