The latest issue of "Camera Lens News" (Zeiss) talks about Gigabit film.
http://www.zeiss.de/C12567A8003B58B9/ContentsWWWIntern/9B38941E0C36CF0DC1256F2C002B7DBB
They say that with their new lenses they can record 400 lp/mm on film.
An earlier issue of the same publication says that they use Velvia to test lenses for color film.
I find it interesting that with all the latest electronic magic they still have to use film to get enough resolution to test lenses.
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