Canon EOS 800D vs Canon EOS 850D: read noise comparison

Input-referred read noise at base ISO: Canon EOS 800D 5.2 e⁻ (ISO 100), Canon EOS 850D 6 e⁻ (ISO 100).

Canon EOS 800D

The Canon EOS 800D was measured at 10 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.36 DN, or 5.2 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 25600 don't change analog gain (digital push). Full well at base ISO is about 35,012 electrons; unity gain is around ISO 220.

Canon EOS 850D

The Canon EOS 850D was measured at 26 ISO settings from ISO 100 to ISO 51200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 2.97 DN, or 6 electrons at the sensor. From ISO 5000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 25600 don't change analog gain (digital push). Full well at base ISO is about 32,267 electrons; unity gain is around ISO 200.

Canon EOS 800D vs Canon EOS 850D read noise table

ISO	Canon EOS 800D	Canon EOS 850D
100	2.362	2.969
125	–	3.891
160	–	2.969
200	3.458	3.555
250	–	4.691
320	–	5.464
400	6.635	6.916
500	–	8.815
640	–	8.938
800	11.551	11.236
1000	–	14.221
1250	–	16.450
1600	19.562	20.821
2000	–	25.992
2500	–	29.651
3200	35.753	36.504
4000	–	46.206
5000	–	49.522
6400	59.714	62.683
8000	–	78.793
10000	–	97.006
12800	119.428	120.259
16000	–	152.219
20000	–	188.706
25600	222.861	233.941
51200	396.177	424.612

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