Adox CMS 20 II is one of the sharpest, fine grain black-and-white films available today. It has an extraordinary resolving power, up to 800 lines per mm. The accompanying Adotech film developer brings perfect halftones and increases the film speed up to ISO 20. This results in images that nobody would believe that were made with a 35mm camera.
When used for normal pictorial photography purposes and developed in the dedicated Adotech film developer, the film achieves a film speed of ISO 20. When used in other film developers like Kodak HC-110 or Rodinal, the film must be exposed at ISO 3-6. However it is recommended to only use the Adotech developer when the film is used for pictorial purposes like portraits since both have been tuned to each other and brought to perfection by with research over the years. The film can also be exposed at ISO 80 but will result in (extremely) high contrast images which makes the CMS 20 II rather a document film.
The film results in nearly grain free enlargements of up to 2,5 meters diagonally. This equals mathematical about 500 Megapixels if you want to compare it the more common digital standards today. The special monodisperse ultra-high-resolution emulsion of the film makes these enlargements possible. The AHU anti-halation layer between the emulsion and the base material guarantees this extreme sharpness while preventing any halation effect. CMS 20 II has an orthopanchromatic sensitization which differentiates perfectly between different colors. The CMS "sees it all". No green filter is necessary when used for portrait photography. The film base is totally transparent which theoretically allows you to reverse develop it and use it as an ultra-high-resolution black-and-white slide film with extreme projecting possibilities. In order to do so you need to combine the reversal process with the Adotech film developer as a first developer.