Development time
Foma Bohemia Retropan 320 Soft in Rodinal
7:00 at 20°C (68°F), 1+25 dilution, box speed.
Start timer · 7:00- Time
- 7:00
- Dilution
- 1+25
- Temperature
- 20°C
- Box speed
- ISO 320
All 2 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+25 | 320 | 7:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+50 | 320 | 14:00 | 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 |
|---|---|---|---|---|---|---|
| 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) |
|---|---|---|
| 1+25 | 12 ml developer + 288 ml water | 19 ml developer + 481 ml water |
| 1+50 | 5.9 ml developer + 294 ml water | 9.8 ml developer + 490 ml water |
How they work together
- Rodinal
- Prominent grain, high acutance, full film speed, variable contrast. Sharp, dramatic, distinct edge effects.
- Foma Bohemia Retropan 320 Soft
- Panchromatic ISO 320/26 film with fine grain and a wide range of half tones and 'soft light', intended for contact printing or 'retro' style enlarging (Foma). Wide exposure latitude: good results from EI 160 to EI 1250. Foma recommends its Retro Special Developer.
- Notes on this pairing
- Fomadon R 09 (Foma's Rodinal-type developer). Guide gives 7 to 8 min; lower figure used (lower value gives lower contrast). Spiral tank: continuous for the first 30 s, then 10 s each minute.
- Fomadon R 09 (Foma's Rodinal-type developer). Guide gives 14 to 16 min; lower figure used (lower value gives lower contrast). Spiral tank: continuous for the first 30 s, then 10 s each minute.
Retropan 320 Soft in other developers
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Ilford FP4 Plus
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Foma Bohemia Fomapan 400 Action
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1+25 · EI 400 · 20°C · 5 variants
Harman Technology Kentmere Pan 400
17:00
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Ilford Ilford Delta 100
9:00
1+25 · EI 100 · 20°C · 4 variants
Kodak Double-X 5222
5:45
1+25 · EI 250 · 20°C · 3 variants