Leica T vs Leica TL: read noise comparison
Input-referred read noise at base ISO: Leica T 12.5 e⁻ (ISO 100), Leica TL 11.7 e⁻ (ISO 100).
Leica T
The Leica T 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 2.01 DN, or 12.5 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 25,432 electrons; unity gain is around ISO 620.
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 T vs Leica TL read noise table
| ISO | Leica T | Leica TL |
|---|---|---|
| 100 | 2.014 | 2.028 |
| 200 | 2.000 | 2.173 |
| 400 | 2.099 | 2.042 |
| 800 | 3.630 | 3.630 |
| 1600 | 6.821 | 6.774 |
| 3200 | 14.420 | 14.320 |
| 6400 | 24.084 | 25.281 |
| 12800 | 50.213 | 49.522 |
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