Ricoh GR vs Ricoh GR IV: read noise comparison

Input-referred read noise at base ISO: Ricoh GR 8.3 e⁻ (ISO 100), Ricoh GR IV 3.3 e⁻ (ISO 100).

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

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 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 vs Ricoh GR IV read noise table

ISO	Ricoh GR	Ricoh GR IV
100	0.908	2.014
125	1.007	2.395
160	0.790	2.412
200	0.889	2.751
250	1.050	3.411
320	1.206	3.160
400	1.485	1.659
500	1.753	1.959
640	2.114	2.173
800	2.676	2.282
1000	3.918	2.789
1250	3.784	3.182
1600	5.134	4.141
2000	6.364	4.993
2500	7.727	6.105
3200	9.918	7.260
4000	13.269	9.190
5000	14.929	11.392
6400	18.636	13.737
8000	23.425	16.795
10000	27.858	22.009
12800	36.252	25.634
16000	44.632	33.128
20000	54.569	41.933
25600	69.071	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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