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Boxed pack of Ilford Ortho Plus black and white film sheets ISO 40/80

Ilford

Ilford Ortho Plus Black & White Film Sheet ISO 40/80

SKU CH-WNX6-KZPH5

Orthochromatic black-and-white sheet film rated ISO 40/80 for copy work and photomicroscopy under red safelight

  • TypeBlack & White Film Sheet
  • Orthochromatic sensitivity enables red safelight handling
  • ISO 40/80 suits controlled copy work lighting
  • Contrast adjustable via developer choice and time
  • Optimised curve preserves original tonal range
  • Designed for continuous tone and line reproduction

Orthochromatic Film Sheet ISO 40/80

Ilford Ortho Plus is a black-and-white sheet film rated at ISO 40/80 for copy work and photomicroscopy. Its orthochromatic sensitivity responds to blue and green light while allowing handling under red safelight conditions. The film suits professionals and amateurs who require accurate tonal reproduction of monochrome originals.

Contrast Control Under Extended Development

The characteristic curve is optimised to maintain the tonal range of the original during prolonged processing sessions. Contrast can be fine-tuned through choice of developer, exposure adjustments and development time without producing flat results. This behaviour supports consistent quality when reproducing combined line and continuous-tone originals over long runs.

Red Safelight Processing Constraint

Orthochromatic sensitivity restricts darkroom illumination to red safelights for inspection during development. The film cannot be handled under white, amber or green safelights without risk of fogging. Users must maintain strict safelight discipline throughout the entire processing sequence to preserve latitude.

Highlights

  • Orthochromatic sensitivity enables red safelight handling
  • ISO 40/80 suits controlled copy work lighting
  • Contrast adjustable via developer choice and time
  • Optimised curve preserves original tonal range
  • Designed for continuous tone and line reproduction

Specifications

BrandILFORD
TypeBlack & White Film Sheet

Questions about this item

Does the ISO 40/80 rating mean I need extra lighting for all-day studio copying?

The orthochromatic emulsion is rated ISO 40/80, so it requires more light than faster films; plan for strong continuous sources or longer exposures during extended sessions.

What developer and safelight must I already have to process these sheets?

You need a red safelight for darkroom handling and a standard black-and-white developer; contrast shifts with developer choice, exposure and development time.

Will this sheet film work in my vintage large-format holders and process alongside older ortho stocks?

Yes, it fits standard sheet-film holders and its blue-green sensitivity matches traditional orthochromatic workflows, so it integrates with existing processing routines.

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