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Panasonic Lumix DMC-GX7 vs Panasonic Lumix DMC-GX8: read noise comparison

Input-referred read noise at base ISO: Panasonic Lumix DMC-GX7 3.4 e⁻ (ISO 125), Panasonic Lumix DMC-GX8 3.8 e⁻ (ISO 200).

Panasonic Lumix DMC-GX7

The Panasonic Lumix DMC-GX7 was measured at 24 ISO settings from ISO 125 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (125) read noise is 0.65 DN, or 3.4 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 6400 don't change analog gain (digital push). Full well at base ISO is about 20,947 electrons; unity gain is around ISO 670.

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-GX7 vs Panasonic Lumix DMC-GX8 read noise table

ISOPanasonic Lumix DMC-GX7Panasonic Lumix DMC-GX8
100–0.877
1250.6461.007
1600.7531.197
2000.7900.946
2500.8351.117
3200.9661.338
4001.1411.591
5001.3761.905
6401.6252.297
8001.8792.313
10002.2352.789
12502.8093.317
16003.4344.000
20004.2574.823
25005.3155.856
32006.2777.210
40007.5689.000
50009.19011.004
640011.63213.548
800015.24217.148
1000018.25221.857
1280023.10327.284
1600030.06517.388
2000036.75821.556
2560045.57027.665

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Data: Photons to Photos · © William J. Claff