Ilford
Classic monochrome style with high latitude and characteristic grain
经典单色风格，高宽容度，特征颗粒
Specifications
ISO
400
Type
Black & White
Process
B&W
Brand Color
#5B8A72
Reciprocity Failure Compensation
Long exposures require compensation for reciprocity failure. Use these values as a starting point when shooting with . For more details, see our Reciprocity Failure Guide. FilmMeter's Light Metering feature can automatically apply these corrections.
Official DataIlford P Factor Formula
This film uses the Ilford reciprocity formula: Corrected Time = Metered TimeP, where P = 1.31.
| Metered Time | Corrected Time | Difference (approx.) |
|---|---|---|
| 1s | 1s | 1.0x |
| 2s | 2.5s | 1.25.25.0x |
| 5s | 8s | 1.60x |
| 10s | 20s | 2.0x |
| 20s | 51s | 2.55x |
| 30s | 1m 25s | 2.83x |
| 1m 0s | 3m 30s | 3.50x |
| 2m 0s | 8m 45s | 4.37x |
Data sourced from official manufacturer documentation.