Orhtochromatic hi-res black and white negative film
ORTA25 is high contrast and extra hi-resolution black and white orthochromatic film. Ortho film is not sensitive to red spectre of light's wave length, thus the image at the negatives is close to the image you may obtain at photographic paper (all the photo papers for wet print are orthochromatic). Due to different tonal reproduction orthochromatic film gives you more options for your creative photo ideas.
ORTA25 was discontinued past the beta-test period as ORTA50 film appears to be the adequate and reasonable substitute for ORTA25 film.