Development time
AgfaPhoto (Lupus Imaging) AgfaPhoto APX 400 (2013-) in Perceptol
23:00 at 20°C (68°F), 1+1 dilution, EI 320 (−⅓ stop).
Start timer · 23:00- Time
- 23:00
- Dilution
- 1+1
- Temperature
- 20°C
- Box speed
- ISO 400
Development time
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+1 | 320−⅓ stop | 23:00 | 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 |
|---|---|---|---|---|---|---|
| 28:45 | 25:46 | 23:00 | 20:42 | 18:24 | 16:34 | 14:57 |
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+1 | 150 ml developer + 150 ml water | 250 ml developer + 250 ml water |
How they work together
- Perceptol
- Moderate acutance, normal contrast. Extremely fine grain, for when a loss of film speed is acceptable.
- AgfaPhoto (Lupus Imaging) AgfaPhoto APX 400 (2013-)
- Budget panchromatic 400 film under the AgfaPhoto name; described as similar to Kentmere Pan 400.
- Notes on this pairing
- Datasheet recommends EI 320 for this row. Tank: first minute continuous, then one inversion every 30 s.
AgfaPhoto APX 400 (2013-) in other developers
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