Every so often the question
comes up: "How well does FilmStar perform with large numbers of layers?"
Frankly, it's hard to know unless there's something to compare with.
We stumbled upon a recent
US patent containing a recipe for a 180 layer edge filter. With all the
extravagant claims, we assumed this was
the best possible design (two other thin film design programs were
referenced in the patent) and frankly doubted it could be improved. Just for fun, we entered the design into FilmStar.
Using 401 optimization targets, FilmStar improved the design in
about two minutes on a 3 GHz computer.
We thought you'd be
interested in seeing the results; we added an original design
evolved from the well-known highpass construction (.5H 1L .5H)^N. The
web graphic you
see was created and saved in PNG format directly by FilmStar, but that's