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

Input-referred read noise at base ISO: Canon EOS 77D 6.1 e⁻ (ISO 100), Canon EOS 7D Mark II 13.8 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 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 77D vs Canon EOS 7D Mark II read noise table

ISO	Canon EOS 77D	Canon EOS 7D Mark II
100	2.990	5.696
125	–	7.062
160	–	4.891
200	3.864	6.148
250	–	7.674
320	–	5.938
400	5.657	7.362
500	–	9.190
640	–	8.056
800	10.556	9.987
1000	–	12.467
1250	–	12.042
1600	19.427	15.780
2000	–	19.160
2500	–	19.160
3200	33.825	24.590
4000	–	29.446
5000	–	33.359
6400	58.081	41.070
8000	–	50.563
10000	–	63.558
12800	115.360	79.893
16000	–	100.427
25600	219.793	155.417
51200	388.023	280.139

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