Development time
Foma Bohemia Retropan 320 Soft in Rollei Supergrain
6:30 at 20°C (68°F), 1+9 dilution, box speed.
Start timer · 6:30- Time
- 6:30
- Dilution
- 1+9
- Temperature
- 20°C
- Box speed
- ISO 320
All 2 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+9 | 320 | 6:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+9 | 640+1 stop | 10:00 | 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 |
|---|---|---|---|---|---|---|
| 8:08 | 7:17 | 6:30 | 5:51 | 5:12 | 4:41 | 4:14 |
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+9 | 30 ml developer + 270 ml water | 50 ml developer + 450 ml water |
How they work together
- 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
- Rollei Supergrain. Datasheet gives 6.5 to 7.5 min; lower figure used.
- Rollei Supergrain, push +1. Datasheet gives 10 to 11 min; lower figure used.
Retropan 320 Soft in other developers
Other films in Rollei Supergrain
Foma Bohemia Fomapan 400 Action
6:00
1+9 · EI 400 · 20°C · 3 variants
Rollei/Maco RPX 400
6:00
1+9 · EI 400 · 20°C · 3 variants
Rollei/Maco RPX 25
4:30
1+9 · EI 25 · 20°C · 3 variants
Foma Bohemia Fomapan 100 Classic
5:30
1+9 · EI 100 · 20°C · 3 variants
Foma Bohemia Fomapan 200 Creative
5:30
1+9 · EI 200 · 20°C · 3 variants
Rollei/Maco Retro 80S
6:00
1+9 · EI 80 · 20°C · 3 variants
Bergger Pancro 400
9:30
1+9 · EI 400 · 20°C · 2 variants
Rollei/Maco RPX 100
5:30
1+9 · EI 100 · 20°C · 4 variants