Quote Originally Posted by JPD View Post
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.
You must remember that sharpness and grain have nothing to do with spectral sensitivity. You also have to remember that the German chemists came up with very "non technical" descriptions for their sensitization which we in the US called by name as short and long red for example, replacing the qualitative names assigned by the Germans. This was probably advertizing, as usually, the US companies didn't mention sensitization except in technical articles.

As for B&W papers, today even the simpler graded contrast papers are ortho sensitive. They are probably made so to match the speed and sensitivity of VC papers to white light (grade 2 normally).

PE