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

Input-referred read noise at base ISO: Canon EOS 7D 12 e⁻ (ISO 100), Canon EOS 800D 5.2 e⁻ (ISO 100).

Canon EOS 7D

The Canon EOS 7D was measured at 20 ISO settings from ISO 100 to ISO 12800. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 6.45 DN, or 12 electrons at the sensor. From ISO 1250 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 3200 don't change analog gain (digital push). Full well at base ISO is about 26,690 electrons; unity gain is around ISO 190.

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 vs Canon EOS 800D read noise table

ISO	Canon EOS 7D	Canon EOS 800D
100	6.453	2.362
125	8.168	–
160	5.657	–
200	7.111	3.458
250	9.126	–
320	8.000	–
400	9.987	6.635
500	12.295	–
640	12.553	–
800	15.562	11.551
1000	19.027	–
1250	21.407	–
1600	26.723	19.562
2000	34.535	–
2500	39.124	–
3200	49.180	35.753
4000	56.103	–
5000	66.257	–
6400	79.341	59.714
12800	143.013	119.428
25600	–	222.861
51200	–	396.177

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