Development time
CatLABS CatLABS X Film 320 (35mm) in T-Max Developer
9:30 at 20°C, 1+4 dilution, box speed.
Start timer · 9:30Time
9:30
Standard
Dilution
1+4
Temperature
20°C
Box speed
ISO 320
B&W
Development time
| Dilution | EI | Time | Temp | Agitation | Timer |
|---|---|---|---|---|---|
| 1+4 | 320 | 9:30 | 20°C / 68°F | Standard | Start timer |
EI is the speed the film was rated at when shooting. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet.
Other temperatures
| 18°C | 19°C | 20°C | 21°C | 22°C | 23°C | 24°C |
|---|---|---|---|---|---|---|
| 11:53 | 10:38 | 9:30 | 8:33 | 7:36 | 6:50 | 6:11 |
Calculated from the 20°C time using Ilford’s temperature compensation factors, not taken from a datasheet. Most B&W developers behave well between 18°C and 24°C.
Mixing
| Dilution | 300 ml (one 35mm roll) | 500 ml (one 120 roll) |
|---|---|---|
| 1+4 | 60 ml developer + 240 ml water | 100 ml developer + 400 ml water |
How they work together
- T-Max Developer
- High acutance, full film speed, normal contrast. Optimised for T-grain films with excellent shadow detail.
- CatLABS CatLABS X Film 320 (35mm)
- Confirmed Kodak Double-X 5222 motion picture stock. Cinematic high contrast look. Note: 120/sheet versions are a different emulsion.