Leica SL3 vs Leica T: read noise comparison

Input-referred read noise at base ISO: Leica SL3 18.9 e⁻ (ISO 100), Leica T 12.5 e⁻ (ISO 100).

Dual gain: Leica SL3 ISO 320, Leica T none.

Leica SL3

The Leica SL3 was measured at 34 ISO settings from ISO 50 to ISO 102400. Values are Bill Claff's (Photons to Photos) direct measurements from raw files.

At base ISO (100) read noise is 1.96 DN, or 18.9 electrons at the sensor. A second gain (dual gain) kicks in at ISO 320, cutting input-referred read noise by about 1 stop. From ISO 32000 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise. Full well at base ISO is about 153,117 electrons; unity gain is around ISO 960.

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 SL3 vs Leica T read noise table

ISO	Leica SL3	Leica T
50	1.558	–
64	1.693	–
80	1.790	–
100	1.959	2.014
125	2.250	–
160	2.567	–
200	3.095	2.000
250	3.655	–
320	2.346	–
400	2.713	2.099
500	3.182	–
640	3.837	–
800	4.563	3.630
1000	5.816	–
1250	7.062	–
1600	8.815	6.821
2000	10.853	–
2500	13.086	–
3200	16.450	14.420
4000	20.678	–
5000	25.992	–
6400	32.223	24.084
8000	39.397	–
10000	46.851	–
12800	55.715	50.213
16000	68.120	–
20000	79.341	–
25600	94.353	–
32000	116.162	–
40000	139.102	–
51200	176.069	–
64000	215.269	–
80000	259.574	–
102400	312.996	–

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