Development time
Rollei/Maco RPX 100 in Perceptol
13:00 at 20°C (68°F), stock dilution, box speed.
Start timer · 13:00- Time
- 13:00
- Dilution
- Stock
- Temperature
- 20°C
- Box speed
- ISO 100
All 4 times
| Dilution | EI | Time | Temp | Agitation | Evidence | Timer |
|---|---|---|---|---|---|---|
| Stock | 50−1 stop | 9:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+1 | 50−1 stop | 13:30 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| Stock | 100 | 13:00 | 20°C / 68°F | Standard | ManufacturerChecked Oct 2026 | Start timer |
| 1+1 | 100 | 16:00 | 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 |
|---|---|---|---|---|---|---|
| 16:15 | 14:34 | 13:00 | 11:42 | 10:24 | 9:22 | 8:27 |
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 |
| 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.
- Rollei/Maco RPX 100
- Medium-speed panchromatic film on triacetate; Rollei quotes very fine grain (RMS 7) and about +/-2 stops of latitude.
- Notes on this pairing
- Pull -1.
RPX 100 in other developers
D-76
9:00
Stock · EI 100 · 20°C · 6 variants
HC-110
8:00
1+31 · EI 100 · 20°C
ID-11
9:00
Stock · EI 100 · 20°C · 5 variants
Ilfosol 3
5:00
1+9 · EI 100 · 20°C · 2 variants
Ilfotec DD-X
9:00
1+4 · EI 100 · 20°C · 3 variants
Microphen
9:00
Stock · EI 100 · 20°C · 5 variants
Rodinal
9:00
1+25 · EI 100 · 20°C · 2 variants
Rollei Supergrain
5:30
1+9 · EI 100 · 20°C · 4 variants
Other films in Perceptol
Ilford HP5 Plus
13:00
Stock · EI 250 · 20°C · 6 variants
Ilford Delta 3200
18:00
Stock · EI 3200 · 20°C · 4 variants
Ilford Delta 400
10:00
Stock · EI 200 · 20°C · 5 variants
Ilford FP4 Plus
12:00
Stock · EI 125 · 20°C · 7 variants
Foma Bohemia Fomapan 400 Action
9:00
Stock · EI 400 · 20°C · 2 variants
Harman Technology Kentmere Pan 400
23:00
1+1 · EI 320 · 20°C
Harman Technology Kentmere Pan 100
12:30
Stock · EI 100 · 20°C · 4 variants
Ilford Ilford Delta 100
15:00
Stock · EI 100 · 20°C · 7 variants