Orthochromatic film, traditionally used for graphics, records either black or clear. Extremely high contrast. It is available in rolls and sheets.
Not being sensitive to red, red objects photographed with orthochromatic films are rendered dark on the print.
Early orthochromatic film had very little sensitivity to red light, leaving red subjects as black in the resulting images. Panchromatic film - originally made by adding dyes to red-insensitive film, a result of work by Dr.
The introduction of orthochromatic film required the spectrum from green to blue to be brought to the same focus.
I am using an orthochromatic film, my standard developer (HC-110), a reasonable exposure time and a easy to maintain development time. Most importantly I wanted to get into the mask density range of 35 to 50 density units with consistency.
 See also: Orthochromatic, Panchromatic, Light, Film, Photograph
  
|
RSS
