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Sony a390 vs Sony a500: read noise comparison

Sony a390DxO

The Sony a390 (DSLR-A390) was measured at 6 ISO settings from ISO 100 to ISO 3200. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (100) read noise is 1.77 DN. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.

Sony a500DxO

The Sony a500 (DSLR-A500) was measured at 7 ISO settings from ISO 200 to ISO 12800. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (200) read noise is 1.58 DN. From ISO 1600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Sony a390 vs Sony a500 read noise table

ISOSony a390Sony a500
1001.765–
2003.7581.580
4006.2772.346
80012.8174.659
160024.2518.515
320040.22414.320
6400–34.297
12800–67.649

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Data: Photons to Photos · © William J. Claff