Development time
Foma Bohemia Fomapan 100 Classic in T-Max Developer
5:00 at 20°C (68°F), 1+4 dilution, box speed.
Start timer · 5:00- Time
- 5:00
- Dilution
- 1+4
- Temperature
- 20°C
- Box speed
- ISO 100
Development time
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+4 | 100 | 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+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. Enhanced shadow detail in normally processed and push-processed film.
- Foma Bohemia Fomapan 100 Classic
- Traditional cubic-grain emulsion with high resolving power and a wide range of halftones (Foma datasheet: RMS 13.5, 110 lines/mm). Rated ISO 100/21 but the maker says it gives good results one stop over (EI 50) or two stops under (EI 400) with no change in development.
- Notes on this pairing
- Kodak T-Max Developer 1+4. Guide gives 5 to 6 min; lower figure used (lower value gives lower contrast). Spiral tank: continuous for the first 30 s, then 10 s each minute.
Fomapan 100 Classic in other developers
510-Pyro
10:30
1+100 · EI 80 · 20°C · 2 variants
D-76
6:30
Stock · EI 100 · 20°C · 3 variants
Diafine
6:00
Stock · EI 200 · 20°C
Fomadon Excel
5:00
Stock · EI 100 · 20°C · 2 variants
Fomadon LQN
7:00
1+10 · EI 100 · 20°C · 3 variants
Fomadon P
7:00
Stock · EI 100 · 20°C · 2 variants
ID-11
6:00
Stock · EI 100 · 20°C · 4 variants
Microphen
5:00
Stock · EI 100 · 20°C · 4 variants
Other films in T-Max Developer
Kodak Tri-X 400
6:00
1+4 · EI 400 · 20°C · 7 variants
Kodak T-Max 400
6:45
1+4 · EI 400 · 20°C · 16 variants
Ilford HP5 Plus
6:30
1+4 · EI 400 · 20°C · 4 variants
Ilford Delta 400
6:30
1+4 · EI 400 · 20°C · 6 variants
Ilford FP4 Plus
8:00
1+4 · EI 125 · 20°C · 2 variants
Foma Bohemia Fomapan 400 Action
7:00
1+4 · EI 400 · 20°C
Ilford Ilford Delta 100
7:00
1+4 · EI 100 · 20°C · 3 variants
Kodak T-Max 100
7:30
1+4 · EI 100 · 20°C · 10 variants