I have a catalog for ordering lens elements and coatings. There are 3 AR Coatings. 350-700 , 800-1100 , 1000-2000.
If I order 12 dollars 1000-2000 nm antireflection coating , does that coating blocks other wavelenghts ?
If it does block , do ordinary BW Film sees that wavelenght portion and what images would look like ?
Mustafa Umut Sarac