description Rollei Ortho 25 Plus Overview
Rollei Ortho 25 Plus is an ISO 25 orthochromatic black-and-white photographic film produced by Maco under the Rollei brand as a replacement for their earlier Rollei Ortho film. As an orthochromatic emulsion, it is sensitive to blue and green light but not to red light, making it suitable for specific technical applications, copy work, and certain landscape photography. The film's extremely slow speed of ISO 25 produces very fine grain and high resolution.
help Rollei Ortho 25 Plus FAQ
What makes Rollei Ortho 25 Plus different from normal black-and-white film?
It is an orthochromatic ISO 25 film, so it is sensitive mainly to blue and green light and has limited sensitivity to red. Red subjects can therefore render unusually dark, which makes the film useful for controlled lighting and distinctive portraits. [Rollei Ortho 25 Plus](https://www.rolleianalog.com/products/rollei-ortho-25-plus/?lang=en)
Which formats does Rollei Ortho 25 Plus come in?
Rollei lists 35 mm, 120 roll film, 35 mm bulk stock, and several sheet-film formats. The low ISO 25 speed makes a tripod or bright light useful for many subjects.
Why do photographers use Ortho 25 Plus for high-detail images?
The technical emulsion is designed for very fine grain, high resolving power, and strong edge sharpness. Rollei lists an exposure latitude of up to plus or minus two apertures, depending on development.
Which developers work with Rollei Ortho 25 Plus?
Rollei's guide lists developers including Rodinal at 1+25 for 5 minutes 30 seconds and Kodak D-76 at 1+1 for 8 minutes at 20 degrees Celsius. These are guide times, so the final result depends on agitation, temperature, and the desired contrast.
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