Quote Originally Posted by Photo Engineer View Post
This has come up several times. People have posted the spectral curves of the film and my observation is that these are just poorly sensitized pan films with low red sensitivity. They are red sensitive, just not as much as other films, so the manufacturers had to come up with a name to describe them.
The ADOX orthopan-films were called "revolutionizing" when they came out in the late 40's because of their sharpness and extremely fine grain. Dr. Schleussner Fotowerke (later called ADOX) was founded in 1860, so they should have had the knowledge about sensitizing film?

Old german photography books tells about orthochromatic, panchromatic, orthopanchromatic and superpanchromatic emulsions.