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Panasonic Lumix DMC-GX8 vs Panasonic Lumix DMC-GX80: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-GX8 3.8 e⁻ (ISO 200), Panasonic Lumix DMC-GX80 3.7 e⁻ (ISO 100).

Panasonic Lumix DMC-GX8

The Panasonic Lumix DMC-GX8 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 (200) read noise is 0.95 DN, or 3.8 electrons at the sensor. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 15,850 electrons; unity gain is around ISO 800.

Panasonic Lumix DMC-GX80

The Panasonic Lumix DMC-GX80 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 3.7 electrons at the sensor. From ISO 1000 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 27,276 electrons; unity gain is around ISO 690.

Panasonic Lumix DMC-GX8 vs Panasonic Lumix DMC-GX80 read noise table

ISO	Panasonic Lumix DMC-GX8	Panasonic Lumix DMC-GX80
100	0.877	0.540
125	1.007	0.642
160	1.197	0.758
200	0.946	0.807
250	1.117	0.865
320	1.338	0.953
400	1.591	1.102
500	1.905	1.329
640	2.297	1.569
800	2.313	1.815
1000	2.789	2.189
1250	3.317	2.639
1600	4.000	3.272
2000	4.823	4.028
2500	5.856	4.925
3200	7.210	6.190
4000	9.000	7.516
5000	11.004	9.514
6400	13.548	11.794
8000	17.148	15.348
10000	21.857	18.765
12800	27.284	23.588
16000	17.388	30.065
20000	21.556	36.758
25600	27.665	46.527

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