Canon EOS 7D Mark II vs Canon EOS 800D: read noise comparison

Input-referred read noise at base ISO: Canon EOS 7D Mark II 13.8 e⁻ (ISO 100), Canon EOS 800D 5.2 e⁻ (ISO 100).

Canon EOS 7D Mark II

The Canon EOS 7D Mark II was measured at 25 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 5.70 DN, or 13.8 electrons at the sensor. From ISO 4000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 16000 don't change analog gain (digital push). Full well at base ISO is about 34,937 electrons; unity gain is around ISO 240.

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 7D Mark II vs Canon EOS 800D read noise table

ISO	Canon EOS 7D Mark II	Canon EOS 800D
100	5.696	2.362
125	7.062	–
160	4.891	–
200	6.148	3.458
250	7.674	–
320	5.938	–
400	7.362	6.635
500	9.190	–
640	8.056	–
800	9.987	11.551
1000	12.467	–
1250	12.042	–
1600	15.780	19.562
2000	19.160	–
2500	19.160	–
3200	24.590	35.753
4000	29.446	–
5000	33.359	–
6400	41.070	59.714
8000	50.563	–
10000	63.558	–
12800	79.893	119.428
16000	100.427	–
25600	155.417	222.861
51200	280.139	396.177

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