Ricoh GR vs Ricoh GR III: read noise comparison

Input-referred read noise at base ISO: Ricoh GR 8.3 e⁻ (ISO 100), Ricoh GR III 2.5 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 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 vs Ricoh GR III read noise table

ISO	Ricoh GR	Ricoh GR III
100	0.908	1.613
125	1.007	1.803
160	0.790	1.693
200	0.889	1.444
250	1.050	1.765
320	1.206	1.972
400	1.485	2.514
500	1.753	3.074
640	2.114	3.227
800	2.676	3.387
1000	3.918	4.500
1250	3.784	5.028
1600	5.134	6.320
2000	6.364	8.000
2500	7.727	9.448
3200	9.918	12.042
4000	13.269	15.455
5000	14.929	19.027
6400	18.636	24.084
8000	23.425	31.559
10000	27.858	38.055
12800	36.252	48.503
16000	44.632	67.182
20000	54.569	73.517
25600	69.071	99.044
32000	–	146.018
40000	–	152.219
51200	–	205.074
64000	–	321.795
80000	–	306.555
102400	–	421.679

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