ILFORD Delta 100 135/24

Characteristics of Ilford DELTA 100 Professional 135-24:

Ilford DELTA 100 Professional 135-24 is a professional black and white panchromatic sensitized negative 35mm film characterized by its flat crystals, high resolution, large dynamic range and rich tonal range. The film's rated sensitivity is ISO 100, but its wide exposure flexibility gives very good results even at moderate overexposure (50 ISO) and underexposure (200 ISO).

Panchromatic films react to reality in a similar way to the human eye, which perceives light rays with wavelengths from approximately 380 nm to 740 nm (visible light), but in some cases can also be sensitive to the UV and IR component of light. It is therefore advisable to have a UV filter on the lens to suppress the effect of radiation on the film material.

In order to achieve the correct sensitivity to the entire spectrum of visible light, this film is sensitized, which guarantees the correct conversion of the colour reality to the grey scale. If the film were not sensitized, it would not be able to respond to light rays of a certain wavelength, and so the resulting photographs would lack some parts of the tonal range. For example, the film would not respond to green, yellow, orange and red, i.e. it would not detect them and on a black and white positive these shades would be black or otherwise dark. Such material finds application mostly only in the field of scientific and industrial photography, where these "deficiencies" are dealt with deliberately.