Canon EOS 850D vs Canon EOS D30: read noise comparison

Input-referred read noise at base ISO: Canon EOS 850D 6 e⁻ (ISO 100), Canon EOS D30 19 e⁻ (ISO 100).

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 D30

The Canon EOS D30 was measured at 5 ISO settings from ISO 100 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.65 DN, or 19 electrons at the sensor. From ISO 200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 800 don't change analog gain (digital push). Full well at base ISO is about 46,046 electrons; unity gain is around ISO 1160.

Canon EOS 850D vs Canon EOS D30 read noise table

ISO	Canon EOS 850D	Canon EOS D30
100	2.969	1.647
125	3.891	–
160	2.969	–
200	3.555	2.621
250	4.691	–
320	5.464	–
400	6.916	4.959
500	8.815	–
640	8.938	–
800	11.236	9.646
1000	14.221	–
1250	16.450	–
1600	20.821	9.580
2000	25.992	–
2500	29.651	–
3200	36.504	–
4000	46.206	–
5000	49.522	–
6400	62.683	–
8000	78.793	–
10000	97.006	–
12800	120.259	–
16000	152.219	–
20000	188.706	–
25600	233.941	–
51200	424.612	–

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