This part of ISO 5 specifies the geometric conditions for measuring ISO diffuse and f/4,5 and f/1,6 projection transmission densities.
Diffuse density is primarily applicable to measurements of photographic images to be viewed on a transparency illuminator (viewing box), to be contact printed, or to be projected with a system employing diffuse irradiation.
Projection density is primarily applicable to measurements of photographic images to be projected with systems employing optical condensers.
Although primarily intended for the measurement of photographic images, the densitometric methods specified in this part of ISO 5 are often applied to optical filters and other transparent materials.
BS 1384-2:2001 history
2010BS ISO 5-2:2009 Photography and graphic technology - Density measurements - Geometric conditions for transmittance density
2001BS 1384-2:2001 Photographic density measurements - Geometric conditions for transmission density