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Pentax K-01 vs Pentax K-1: read noise comparison

Pentax K-01DxO

The Pentax K-01 was measured at 9 ISO settings from ISO 100 to ISO 25600. Values were derived by Bill Claff from DxOMark lab data.

At base ISO (100) read noise is 0.70 DN. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.

Pentax K-1

The Pentax K-1 was measured at 30 ISO settings from ISO 100 to ISO 204800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.20 DN, or 3.1 electrons at the sensor. From ISO 320 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 51200 don't change analog gain (digital push). Full well at base ISO is about 41,653 electrons; unity gain is around ISO 250.

Pentax K-01 vs Pentax K-1 read noise table

ISOPentax K-01Pentax K-1
1000.6971.197
125–1.444
160–1.659
2001.0282.042
250–2.532
320–2.928
4001.7053.605
500–4.595
640–5.352
8002.8686.727
1000–8.634
1250–10.196
16005.27813.086
2000–17.630
2500–19.973
320013.83325.992
4000–34.060
5000–40.224
640027.47451.984
8000–68.594
10000–79.341
1280058.081103.968
16000–138.141
20000–158.683
25600119.428206.500
32000–266.871
40000–315.173
51200–404.501
102400–809.002
204800–1,606.828

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Data: Photons to Photos · © William J. Claff