Nikon Coolpix P1000 vs Nikon Coolpix P340: read noise comparison

The Nikon Coolpix P1000 was measured at 7 ISO settings from ISO 100 to ISO 6400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.92 DN, or 2.5 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 5,039 electrons; unity gain is around ISO 130.

The Nikon Coolpix P340 was measured at 9 ISO settings from ISO 80 to ISO 12800. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (80) read noise is 1.13 DN. A second gain (dual gain) kicks in at ISO 12800, cutting input-referred read noise by about 1.5 stop. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.