Ricoh GR III vs Ricoh GR IV: read noise comparison

Input-referred read noise at base ISO: Ricoh GR III 2.5 e⁻ (ISO 100), Ricoh GR IV 3.3 e⁻ (ISO 100).

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

Ricoh GR III

The Ricoh GR III was measured at 31 ISO settings from ISO 100 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.61 DN, or 2.5 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 25600 don't change analog gain (digital push). Full well at base ISO is about 25,500 electrons; unity gain is around ISO 160.

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 III vs Ricoh GR IV read noise table

ISO	Ricoh GR III	Ricoh GR IV
100	1.613	2.014
125	1.803	2.395
160	1.693	2.412
200	1.444	2.751
250	1.765	3.411
320	1.972	3.160
400	2.514	1.659
500	3.074	1.959
640	3.227	2.173
800	3.387	2.282
1000	4.500	2.789
1250	5.028	3.182
1600	6.320	4.141
2000	8.000	4.993
2500	9.448	6.105
3200	12.042	7.260
4000	15.455	9.190
5000	19.027	11.392
6400	24.084	13.737
8000	31.559	16.795
10000	38.055	22.009
12800	48.503	25.634
16000	67.182	33.128
20000	73.517	41.933
25600	99.044	53.446
32000	146.018	66.257
40000	152.219	89.884
51200	205.074	104.691
64000	321.795	135.298
80000	306.555	168.897
102400	421.679	215.269
128000	–	265.028
160000	–	326.288
204800	–	418.766

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