Leica TL2 vs Leica X1: read noise comparison
Input-referred read noise at base ISO: Leica TL2 9.2 e⁻ (ISO 100), Leica X1 7.6 e⁻ (ISO 200).
Leica TL2
The Leica TL2 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 3.16 DN, or 9.2 electrons at the sensor. From ISO 25600 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 47,657 electrons; unity gain is around ISO 290.
Leica X1
The Leica X1 was measured at 6 ISO settings from ISO 100 to ISO 3200. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.
At base ISO (200) read noise is 2.11 DN, or 7.6 electrons at the sensor. From ISO 200 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 14,697 electrons; unity gain is around ISO 720.
Leica TL2 vs Leica X1 read noise table
| ISO | Leica TL2 | Leica X1 |
|---|---|---|
| 100 | 3.160 | 2.346 |
| 200 | 5.426 | 2.114 |
| 400 | 6.409 | 3.580 |
| 800 | 5.502 | 7.260 |
| 1600 | 9.318 | 14.520 |
| 3200 | 17.268 | 30.065 |
| 6400 | 17.268 | – |
| 12800 | 34.060 | – |
| 25600 | 59.302 | – |
| 51200 | 107.635 | – |
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