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Pentax K-5 II vs Pentax K-5 II s: read noise comparison

Pentax K-5 IIDxO

The Pentax K-5 II was measured at 11 ISO settings from ISO 80 to ISO 51200. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (80) read noise is 1.14 DN. Read noise keeps falling across the measured range, so the camera isn't fully ISO-invariant there.

Pentax K-5 II s

The Pentax K-5 II s was measured at 29 ISO settings from ISO 80 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (80) read noise is 1.13 DN, or 3.3 electrons at the sensor. From ISO 2000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 47,442 electrons; unity gain is around ISO 230.

Pentax K-5 II vs Pentax K-5 II s read noise table

ISOPentax K-5 IIPentax K-5 II s
801.1411.125
1001.3011.310
125–1.602
160–1.853
2002.4792.297
250–2.868
320–3.317
4004.2874.170
500–5.205
640–6.105
8007.9457.727
1000–9.849
1250–11.632
160018.63615.348
2000–11.632
2500–13.833
320044.63218.126
4000–23.588
5000–27.858
640086.22336.504
8000–47.505
10000–56.886
12800164.27972.505
16000–91.773
20000–110.661
25600337.794142.025
32000–178.527
40000–212.306
51200455.087278.204

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Data: Photons to Photos · © William J. Claff