Development time
Foma Bohemia Foma Ortho 400 in Microphen
8:00 at 20°C (68°F), stock dilution, box speed.
Start timer · 8:00- Time
- 8:00
- Dilution
- Stock
- Temperature
- 20°C
- Box speed
- ISO 400
All 2 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| Stock | 400 | 8:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| Stock | 400 | 3:30 | 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 |
|---|---|---|---|---|---|---|
| 10:00 | 8:58 | 8:00 | 7:12 | 6:24 | 5:46 | 5:12 |
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
- Microphen
- Fine grain, moderate acutance, normal contrast. Fine grain with an effective speed increase.
- 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
- Microphen stock. Datasheet gives 8 to 9 min; lower figure used.
- Microphen stock. Datasheet alternative at 30 °C.
Foma Ortho 400 in other developers
D-76
7:00
Stock · EI 400 · 20°C · 2 variants
Fomadon Excel
7:00
Stock · EI 400 · 20°C · 2 variants
Fomadon LQN
8:30
1+10 · EI 400 · 20°C · 2 variants
Fomadon P
9:30
Stock · EI 400 · 20°C · 2 variants
ID-11
7:00
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
Other films in Microphen
Ilford HP5 Plus
6:30
Stock · EI 400 · 20°C · 7 variants
Ilford Delta 3200
9:00
Stock · EI 3200 · 20°C · 8 variants
Ilford Delta 400
6:30
Stock · EI 400 · 20°C · 12 variants
Ilford FP4 Plus
8:00
Stock · EI 125 · 20°C · 7 variants
Foma Bohemia Fomapan 400 Action
8:00
Stock · EI 400 · 20°C · 4 variants
Harman Technology Kentmere Pan 400
8:00
Stock · EI 400 · 20°C · 4 variants
Harman Technology Kentmere Pan 100
8:30
Stock · EI 100 · 20°C · 5 variants
Ilford Ilford Delta 100
6:30
Stock · EI 100 · 20°C · 7 variants