Development time
Foma Bohemia Foma Ortho 400 in Fomadon Excel
7:00 at 20°C (68°F), stock dilution, box speed.
Start timer · 7:00- Time
- 7:00
- Dilution
- Stock
- Temperature
- 20°C
- Box speed
- ISO 400
All 2 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| Stock | 400 | 7:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| Stock | 400 | 2:00 | 30°C / 86°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) |
|---|---|---|
| Stock | Use as mixed, undiluted | Use as mixed, undiluted |
How they work together
- Foma Bohemia Foma Ortho 400
- Orthochromatic black-and-white negative film, ISO 400/27 (Foma datasheet: RMS 17.5, 85 lp/mm), with high green sensitivity and high maximum density; handle under orange safelight (585 nm and above), never green. Sold as 120, 35mm 135-36 and sheet film (sheet sizes not stated).
- Notes on this pairing
- Fomadon Excel.
- Fomadon Excel. Datasheet alternative at 30 °C.
Foma Ortho 400 in other developers
D-76
7:00
Stock · EI 400 · 20°C · 2 variants
Fomadon LQN
8:30
1+10 · EI 400 · 20°C · 2 variants
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9:30
Stock · EI 400 · 20°C · 2 variants
ID-11
7:00
Stock · EI 400 · 20°C · 2 variants
Microphen
8:00
Stock · EI 400 · 20°C · 2 variants
Perceptol
9:00
Stock · EI 400 · 20°C · 2 variants
Rodinal
10:00
1+50 · EI 400 · 20°C