Panasonic Lumix DMC-FZ28 vs Panasonic Lumix DMC-FZ50: read noise comparison

The Panasonic Lumix DMC-FZ28 was measured at 5 ISO settings from ISO 100 to ISO 1600. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (100) read noise is 3.58 DN. A second gain (dual gain) kicks in at ISO 1600, cutting input-referred read noise by about 1.9 stop. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.

The Panasonic Lumix DMC-FZ50 was measured at 5 ISO settings from ISO 100 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 5.06 DN, or 7 electrons at the sensor. From ISO 100 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 5,640 electrons; unity gain is around ISO 140.