FOMA Ortho 400 is a special orthochromatically sensitized black and white negative
film. It is characterized by good resolving power and contour sharpness, fine grain
and high maximum density of the silver image. Its high optical sensitivity enables to
take photographs even in adverse light conditions and using shorter exposure times.

The nominal optical sensitivity of the film is ISO 400/27°, but its wide exposure
latitude provides very good results even when overexposed by 1.5 EV (ISO
160/23°) and underexposed by 2 EV (ISO 1600/33°). In case of exposure by lower
chromaticity temperature (2700-2400 K) than daylight is recommended moderate
adjustment of the exposure by 0,1-1 EV, especially by underexposure of the film (El
800 ISO and higher) with an absence of modification of development time (push
process). Thanks to its typical tonal character, this orthochromatic type of the film is
particularly suitable for artistically stylized portrait photography. FOMA Ortho 400
has a high level of the spectral sensitivity in green part of the visible spectrum, which
is particularly advantageous when taken photographs of the landscape motifs and
sceneries (forest greenness of the leaves of trees, bushes, etc.).