Canon EOS 1D Mark II vs Canon EOS 1D Mark II N: read noise comparison

Input-referred read noise at base ISO: Canon EOS 1D Mark II 26.4 e⁻ (ISO 100), Canon EOS 1D Mark II N 26 e⁻ (ISO 100).

Canon EOS 1D Mark II

The Canon EOS 1D Mark II was measured at 15 ISO settings from ISO 50 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.60 DN, or 26.4 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 1600 don't change analog gain (digital push). Full well at base ISO is about 65,323 electrons; unity gain is around ISO 1640.

Canon EOS 1D Mark II N

The Canon EOS 1D Mark II N was measured at 15 ISO settings from ISO 50 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.57 DN, or 26 electrons at the sensor. From ISO 640 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Settings above ISO 1600 don't change analog gain (digital push). Full well at base ISO is about 66,003 electrons; unity gain is around ISO 1670.

Canon EOS 1D Mark II vs Canon EOS 1D Mark II N read noise table

ISO	Canon EOS 1D Mark II	Canon EOS 1D Mark II N
50	1.454	1.424
100	1.602	1.569
125	1.866	1.790
160	2.219	2.129
200	1.815	1.840
250	2.158	2.158
320	2.567	2.621
400	2.395	2.549
500	2.888	3.074
640	3.506	3.784
800	3.891	4.257
1000	4.790	5.315
1250	5.979	6.635
1600	7.311	8.168
3200	14.520	16.336

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