Development time
Rollei/Maco Infrared 400 in Ilfosol 3
5:00 at 20°C (68°F), 1+3 dilution, box speed.
Start timer · 5:00- Time
- 5:00
- Dilution
- 1+3
- Temperature
- 20°C
- Box speed
- ISO 400
Development time
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+3 | 400 | 5:00 | 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 |
|---|---|---|---|---|---|---|
| 6:15 | 5:36 | 5:00 | 4:30 | 4:00 | 3:36 | 3:15 |
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+3 | 75 ml developer + 225 ml water | 125 ml developer + 375 ml water |
How they work together
- Ilfosol 3
- High acutance, full film speed, medium-high contrast. Good general purpose results.
- Rollei/Maco Infrared 400
- Near-infrared sensitive B&W film (to about 750 nm) on clear polyester; with a 695-720 nm filter gives the classic white-foliage 'wood effect'. Rollei rates it ISO 200-400 without filter.
- Notes on this pairing
- The datasheet prints dilution 1+3, stronger than Ilford's own 1+9 and 1+14.
Infrared 400 in other developers
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 Delta 400
7:00
1+9 · EI 400 · 20°C · 6 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