Canon EOS 77D vs Canon EOS 7D: read noise comparison

Input-referred read noise at base ISO: Canon EOS 77D 6.1 e⁻ (ISO 100), Canon EOS 7D 12 e⁻ (ISO 100).

Canon EOS 77D

The Canon EOS 77D 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 2.99 DN, or 6.1 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 32,464 electrons; unity gain is around ISO 200.

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 77D vs Canon EOS 7D read noise table

ISO	Canon EOS 77D	Canon EOS 7D
100	2.990	6.453
125	–	8.168
160	–	5.657
200	3.864	7.111
250	–	9.126
320	–	8.000
400	5.657	9.987
500	–	12.295
640	–	12.553
800	10.556	15.562
1000	–	19.027
1250	–	21.407
1600	19.427	26.723
2000	–	34.535
2500	–	39.124
3200	33.825	49.180
4000	–	56.103
5000	–	66.257
6400	58.081	79.341
12800	115.360	143.013
25600	219.793	–
51200	388.023	–

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