Panasonic Lumix DMC-G7 vs Panasonic Lumix DMC-GF1: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-G7 4 e⁻ (ISO 100), Panasonic Lumix DMC-GF1 14 e⁻ (ISO 100).

Panasonic Lumix DMC-G7

The Panasonic Lumix DMC-G7 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 0.54 DN, or 4 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 29,041 electrons; unity gain is around ISO 740.

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-G7 vs Panasonic Lumix DMC-GF1 read noise table

ISO	Panasonic Lumix DMC-G7	Panasonic Lumix DMC-GF1
100	0.540	4.028
125	0.651	5.063
160	0.774	6.364
200	0.841	6.190
250	0.871	7.781
320	0.979	9.781
400	1.173	11.632
500	1.385	14.520
640	1.602	18.252
800	1.905	22.471
1000	2.250	28.246
1250	2.789	35.506
1600	3.387	45.570
2000	4.228	56.886
2500	5.315	72.004
3200	6.498	91.773
4000	8.112	–
5000	9.646	–
6400	12.467	–
8000	15.889	–
10000	19.427	–
12800	25.107	–
16000	31.779	–
20000	38.854	–
25600	48.168	–

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