Rollei RPX 25

B&W NegativeISO 25

Characteristics

  • Grain: fine
  • Contrast: high
  • Latitude: narrow
  • Formats available: 35mm, 120

Rollei RPX 25 is Maco/Rollei's slow B&W film at ISO 25 — the slowest current-production B&W film globally (alongside discontinued Adox CHS 25 II). RPX 25 is designed for maximum-resolution work: ultra-fine grain, very high acutance, suited to landscape and scientific applications where resolution matters more than speed.

Key features

  • ISO 25 rated; very fine grain
  • High contrast — narrow exposure latitude
  • Polyester base — dimensionally stable
  • Available in 35mm and 120 in current production
  • Manufactured by Maco in Germany under the Rollei brand

Workflow

  • Box-speed development: D-76 1:1 at 7 min, HC-110 Dil B at 4 min, Rodinal 1:50 at 8 min
  • Does not push well — gain a stop with care; EI 100 produces compressed shadows
  • Pull to EI 12 in dilute developer for high-contrast scenes
  • Tripod required at base ISO 25 in most lighting

Practical notes

  • RPX 25 is the choice for maximum-resolution landscape and architectural work
  • Compares to Ilford Pan F Plus 50 and the discontinued Adox CMS 20 II in the slow-fine-grain niche
  • Reciprocity failure matters at long exposures; correction tables published by Maco
  • Cold storage extends shelf life

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