Samsung NX2000 vs Samsung NX500: read noise comparison

Input-referred read noise at base ISO: Samsung NX2000 2.8 e⁻ (ISO 100), Samsung NX500 3.4 e⁻ (ISO 100).

Samsung NX2000

The Samsung NX2000 was measured at 25 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 0.26 DN, or 2.8 electrons at the sensor. From ISO 100 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 12800 don't change analog gain (digital push). Full well at base ISO is about 43,747 electrons; unity gain is around ISO 1070.

Samsung NX500

The Samsung NX500 was measured at 25 ISO settings from ISO 100 to ISO 25600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.78 DN, or 3.4 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 31,154 electrons; unity gain is around ISO 190.

Samsung NX2000 vs Samsung NX500 read noise table

ISO	Samsung NX2000	Samsung NX500
100	0.261	1.778
125	0.342	1.972
160	0.460	2.497
200	0.551	2.908
250	0.727	3.411
320	0.953	4.170
400	1.102	5.169
500	1.495	6.148
640	1.959	7.674
800	2.445	9.514
1000	3.031	11.158
1250	3.811	14.123
1600	4.627	17.388
2000	5.776	20.821
2500	7.413	26.538
3200	9.918	33.128
4000	11.551	40.504
5000	14.929	53.076
6400	19.027	65.345
8000	22.316	79.893
10000	30.910	103.968
12800	37.792	129.787
16000	41.355	152.219
20000	51.625	187.403
25600	67.182	230.720

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