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Ilford Ortho Plus is a black-and-white negative film with an orthochromatic spectral response. Unlike panchromatic films, orthochromatic materials have limited sensitivity to red light, which changes how colored subjects are rendered as shades of gray. Ilford markets Ortho Plus for applications such...
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Rollei Ortho 25 is a very slow, orthochromatic black-and-white negative film with a nominal sensitivity of ISO 25. It is designed for photographers who want high resolving power and strong tonal separation in controlled lighting. The film is available in 35 mm, 120 roll film, bulk 35 mm, and selecte...
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