Rollei/Maco Ortho 25 Plus in Perceptol

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”.

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).

Perceptol

Moderate acutance, normal contrast. Extremely fine grain, for when a loss of film speed is acceptable.

Rollei/Maco Ortho 25 Plus

Very fine grained, high-resolution orthochromatic film; replaced Rollei Ortho 25 in 2017.

• D-76

  8:00

  1+1 · EI 25 · 20°C

• ID-11

  8:00

  1+1 · EI 25 · 20°C

• Rodinal

  5:30

  1+25 · EI 25 · 20°C · 2 variants

• Rollei Supergrain

  5:30

  1+12 · EI 25 · 20°C

• T-Max Developer

  7:00

  1+4 · EI 25 · 20°C

• 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

All 23 films in Perceptol