Canon EOS 250D vs Canon EOS 300D: read noise comparison
Input-referred read noise at base ISO: Canon EOS 250D 7.1 e⁻ (ISO 100), Canon EOS 300D 16.1 e⁻ (ISO 100).
Canon EOS 250D
The Canon EOS 250D 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 3.29 DN, or 7.1 electrons at the sensor. From ISO 6400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 34,103 electrons; unity gain is around ISO 210.
Canon EOS 300D
The Canon EOS 300D was measured at 5 ISO settings from ISO 100 to ISO 1600. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (100) read noise is 1.83 DN, or 16.1 electrons at the sensor. From ISO 400 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 34,805 electrons; unity gain is around ISO 880.
Canon EOS 250D vs Canon EOS 300D read noise table
| ISO | Canon EOS 250D | Canon EOS 300D |
|---|---|---|
| 100 | 3.294 | 1.828 |
| 200 | 4.408 | 2.694 |
| 400 | 5.816 | 4.691 |
| 800 | 11.551 | 8.754 |
| 1600 | 20.112 | 17.388 |
| 3200 | 35.017 | – |
| 6400 | 60.129 | – |
| 12800 | 114.563 | – |
| 25600 | 225.972 | – |
| 51200 | 407.315 | – |
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