TREN
Mamiya ZD Back read noise vs ISO
The Mamiya ZD Back was measured at 4 ISO settings from ISO 50 to ISO 400. Values were derived by Bill Claff from DxOMark lab data.
At base ISO (50) read noise is 2.03 DN. From ISO 50 up the camera is effectively ISO-invariant: raising ISO further doesn't meaningfully lower shadow noise.
Mamiya ZD Back read noise table
| ISO | Read noise (DN) | log₂ |
|---|---|---|
| 50 | 2.028 | 1.02 |
| 100 | 4.377 | 2.13 |
| 200 | 8.000 | 3.00 |
| 400 | 16.679 | 4.06 |