Leica TL vs Leica X1: read noise comparison
Input-referred read noise at base ISO: Leica TL 11.7 e⁻ (ISO 100), Leica X1 7.6 e⁻ (ISO 200).
Leica TL
The Leica TL was measured at 8 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 2.03 DN, or 11.7 electrons at the sensor. From ISO 800 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 23,739 electrons; unity gain is around ISO 580.
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 TL vs Leica X1 read noise table
| ISO | Leica TL | Leica X1 |
|---|---|---|
| 100 | 2.028 | 2.346 |
| 200 | 2.173 | 2.114 |
| 400 | 2.042 | 3.580 |
| 800 | 3.630 | 7.260 |
| 1600 | 6.774 | 14.520 |
| 3200 | 14.320 | 30.065 |
| 6400 | 25.281 | – |
| 12800 | 49.522 | – |
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