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Panasonic Lumix DMC-G85 vs Panasonic Lumix DMC-GF1: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-G85 5.2 e⁻ (ISO 160), Panasonic Lumix DMC-GF1 14 e⁻ (ISO 100).

Panasonic Lumix DMC-G85

The Panasonic Lumix DMC-G85 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 (160) read noise is 1.18 DN, or 5.2 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 6400 don't change analog gain (digital push). Full well at base ISO is about 17,253 electrons; unity gain is around ISO 690.

Panasonic Lumix DMC-GF1

The Panasonic Lumix DMC-GF1 was measured at 16 ISO settings from ISO 100 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 4.03 DN, or 14 electrons at the sensor. From ISO 200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 14,148 electrons; unity gain is around ISO 350.

Panasonic Lumix DMC-G85 vs Panasonic Lumix DMC-GF1 read noise table

ISO	Panasonic Lumix DMC-G85	Panasonic Lumix DMC-GF1
100	1.014	4.028
125	1.102	5.063
160	1.181	6.364
200	1.266	6.190
250	1.283	7.781
320	1.385	9.781
400	1.591	11.632
500	1.765	14.520
640	2.000	18.252
800	2.329	22.471
1000	2.732	28.246
1250	3.227	35.506
1600	4.000	45.570
2000	4.724	56.886
2500	5.816	72.004
3200	7.210	91.773
4000	8.574	–
5000	10.556	–
6400	13.086	–
8000	16.795	–
10000	20.966	–
12800	25.992	–
16000	33.128	–
20000	41.355	–
25600	51.268	–

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