Rollei Ortho 25 is a technical, orthochromatic black and white photographic film with a nominal sensitivity of ISO 25/15 °.
This is different to most modern black and white films, which are PANchromatic.
Ortho 25 offers exceptionally fine grain images with high sharpness.
It is commonly used for technical and scientific applications and as a half-tone film for pictorial photography, but can produce some impressive images used as a traditional black and white film too.
The crystal-clear RC base opens up the possibility of using the film as a B&W slide film also.
– 25 iso orthochromatic black and white film
– Can be used for Astrophotography
– Can be used for black and white slides and blue slides
– Also available in 35mm format