Originally coated for aerial surveillance and cartography used by the Russian aerospace industry, “D” is a panchromatic negative film, offering high contrast and moderate grain.
When you need high sensitivity and small aperture. This film can be pushed at 1600 iso and also be processed as a slide film.
“D” is a very thin film and it can be delicate to load it in processing tanks. You can tape a piece of thicker leader film onto it to make it easier to introduce in the reel.
The use of the recycled cassettes is not recommanded with fully automatic/motorized cameras.