Development time
Rollei/Maco Retro 400S in Rodinal
10:30 at 20°C (68°F), 1+25 dilution, box speed.
Start timer · 10:30- Time
- 10:30
- Dilution
- 1+25
- Temperature
- 20°C
- Box speed
- ISO 400
All 2 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| 1+25 | 400 | 10:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+50 | 400 | 22:00 | 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 |
|---|---|---|---|---|---|---|
| 13:08 | 11:46 | 10:30 | 9:27 | 8:24 | 7:34 | 6:50 |
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.
- Rollei/Maco Retro 400S
- Super-panchromatic 400 film on polyester (sensitivity 380-730 nm) with fine grain (RMS 11) and about +/-2 stops latitude; pushes to EI 800.
- Notes on this pairing
- Datasheet names R09/Rodinal.
Retro 400S in other developers
D-76
12:00
Stock · EI 400 · 20°C · 2 variants
HC-110
10:00
1+31 · EI 400 · 20°C
ID-11
12:00
Stock · EI 400 · 20°C · 2 variants
Ilfosol 3
12:00
1+9 · EI 400 · 20°C · 4 variants
Ilfotec DD-X
10:00
1+4 · EI 400 · 20°C · 2 variants
Microphen
16:00
1+1 · EI 400 · 20°C
Rollei Supergrain
8:00
1+9 · EI 400 · 20°C · 3 variants
T-Max Developer
7:00
1+4 · EI 400 · 20°C · 3 variants
Other films in Rodinal
Kodak Tri-X 400
7:00
1+25 · EI 400 · 20°C · 3 variants
Ilford HP5 Plus
6:00
1+25 · EI 400 · 20°C · 4 variants
Ilford Delta 400
9:00
1+25 · EI 400 · 20°C · 4 variants
Ilford FP4 Plus
9:00
1+25 · EI 125 · 20°C · 4 variants
Foma Bohemia Fomapan 400 Action
5:30
1+25 · EI 400 · 20°C · 5 variants
Harman Technology Kentmere Pan 400
17:00
1+25 · EI 400 · 20°C · 3 variants
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