Development time
Ilford Delta 400 in Ilfosol 3
7:00 at 20°C (68°F), 1+9 dilution, box speed.
Start timer · 7:00- Time
- 7:00
- Dilution
- 1+9
- Temperature
- 20°C
- Box speed
- ISO 400
All 6 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+9 | 200−1 stop | 5:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+9 | 400 | 7:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+9 | 800+1 stop | 14:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+14 | 200−1 stop | 8:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+14 | 400 | 12:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+14 | 800+1 stop | 20:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
EI is the speed the film was rated at when shooting. Evidence says where each time comes from: the manufacturer’s own data, a named test, a compilation or several agreeing reports (community consensus), or one person’s report. Times marked “not yet verified” come from secondary sources and haven’t been checked against a manufacturer datasheet. Where sources give different times, every one is listed and marked “sources differ”.
Other temperatures
| 18°C64°F | 19°C66°F | 20°C68°F | 21°C70°F | 22°C72°F | 23°C73°F | 24°C75°F |
|---|---|---|---|---|---|---|
| 8:45 | 7:50 | 7:00 | 6:18 | 5:36 | 5:02 | 4:33 |
Calculated from the 20°C (68°F) time using Ilford’s temperature compensation factors, not taken from a datasheet. Most B&W developers behave well between 18–24°C (64–75°F).
Mixing
| Dilution | 300 ml (10.1 fl oz) (one 35mm roll) | 500 ml (16.9 fl oz) (one 120 roll) |
|---|---|---|
| 1+9 | 30 ml developer + 270 ml water | 50 ml developer + 450 ml water |
| 1+14 | 20 ml developer + 280 ml water | 33 ml developer + 467 ml water |
How they work together
- Ilfosol 3
- High acutance, full film speed, medium-high contrast. Good general purpose results.
- Ilford Delta 400
- Modern core-shell T-grain ISO 400 film with fine grain and high sharpness; Ilford recommends exposure from EI 200 to 1600. Sold in 35mm and 120 (no sheet film listed).
Delta 400 in other developers
510-Pyro
22:00
1+100 · EI 400 · 20°C · 2 variants
D-76
9:30
Stock · EI 400 · 20°C · 9 variants
HC-110
7:30
1+31 · EI 400 · 20°C · 8 variants
ID-11
9:30
Stock · EI 400 · 20°C · 9 variants
Ilfotec DD-X
8:00
1+4 · EI 400 · 20°C · 6 variants
Ilfotec HC
7:30
1+31 · EI 400 · 20°C · 11 variants
Ilfotec LC29
7:30
1+19 · EI 400 · 20°C · 11 variants
Microphen
6:30
Stock · EI 400 · 20°C · 12 variants
Other films in Ilfosol 3
Ilford HP5 Plus
6:30
1+9 · EI 400 · 20°C · 7 variants
Ilford Delta 3200
11:00
1+9 · EI 3200 · 20°C · 10 variants
Ilford FP4 Plus
4:15
1+9 · EI 125 · 20°C · 3 variants
Harman Technology Kentmere Pan 400
6:30
1+9 · EI 400 · 20°C · 5 variants
Harman Technology Kentmere Pan 100
5:00
1+9 · EI 100 · 20°C · 2 variants
Ilford Ilford Delta 100
5:00
1+9 · EI 100 · 20°C · 2 variants
Ilford Pan F Plus 50
4:30
1+14 · EI 50 · 20°C
Rollei/Maco RPX 400
6:30
1+9 · EI 400 · 20°C · 4 variants